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# Only for geniuses!

Anonymous Coward
User ID: 27582823
France
11/15/2013 10:26 PM
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Re: Only for geniuses!
Sorry typo, last line of last post should be
We have 8=72
Anonymous Coward
User ID: 49969317
United States
11/15/2013 10:27 PM
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Re: Only for geniuses!
jesus christ. this really is not very hard.

2=6
3=12
4=20
5=30
6=42
7=56
8=72
9=90

1=2

the difference between the answer of one problem and the answer of the next is equal to double the first number.

12-6=3*2
20-12=4*2
90-72=9*2

or

the first number multiplied by the first number of the next problem equals the solution of the first problem.

3*2=6
4*3=12
5*4=20
10*9=90

simple.
Anonymous Coward
User ID: 49953507
United States
11/15/2013 10:27 PM
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Re: Only for geniuses!
18
Quoting: Anonymous Coward 49953507

IF: 2=6
3=12
4=20
5=30
6=42
Then:9=??

Well then:
12 to 20 = 8
20 to 30 = 10
30 to 42 = 12
etc...

7 would equate to a summed difference of 14
8 would equate to a summed difference of 16
9 would equate to a summed difference of 18
Anonymous Coward
User ID: 4396096
United States
11/15/2013 10:29 PM
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Re: Only for geniuses!
No 56
Quoting: Anonymous Coward 4396096

Close. It's 57. You need to catchup on your math skills.
Quoting: Anonymous Coward 2732544

ProNerd

User ID: 13856469
United States
11/15/2013 10:32 PM
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Re: Only for geniuses!
the next digit after 9 is 0
Quoting: Paige

2*3
3*4
4*5
5*6
6*7
7*8
8*9
9*0

Actualisation:

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

As I said, my kind of girl...
Quoting: Anonymous Coward 27582823

This breaks down if you keep going.
Quoting: ProNerd

the next digit after 9 is 0
Quoting: Paige

2*3
3*4
4*5
5*6
6*7
7*8
8*9
9*0

Actualisation:

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

As I said, my kind of girl...
Quoting: Anonymous Coward 27582823

This breaks down if you keep going.
Quoting: ProNerd

2 * (3 modulo 10) = 6
3 * (4 modulo 10) = 12
4 * (5 modulo 10) = 20
5 * (6 modulo 10) = 30
6 * (7 modulo 10) = 42
This a match.
and 9 * (10 modulo 10) = 0
Quoting: Anonymous Coward 27582823

so...
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*-1=-10
11*-2=-22
12*-3=-36

or

2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
0*-1=-0
-1*-2=2
-3*-3=9

I'm saying that if you continue your pattern it fails to plot a constant curve.

an in....

IF: 2=6
3=12 6+6
4=20 12+8
5=30 20+10
6=42 30+12
7=56 42+14
8=72 56+16
9=90 72+18
10=110 90+20
11=132 110+22
12=156 132+24
13=182 156+26

or

2x3=6
3x4=12
4x5=20
5x6=30
6x7=42
7x8=56
8x9=64
9x10=90
10x11=110
11x12=132
12x13=156
13x14=182

these are the two simple patterns I see, both indicate 9=90
Anonymous Coward
User ID: 27582823
France
11/15/2013 10:33 PM
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Re: Only for geniuses!
Reminder for new page and new comers. Correct answers so far

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)
and give f(9)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

There is also a strange cabal which insist saying 72 is correct but failing to define f(n).
Anonymous Coward
User ID: 17260532
11/15/2013 10:34 PM
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Re: Only for geniuses!
2x3 =6
3x4 =12
4x5 =20
5x6 =30
6x7 =42
7x8 =56
8*9 =72
9x10=90
Anonymous Coward (OP)
User ID: 49763587
United States
11/15/2013 10:35 PM
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Re: Only for geniuses!
72 and I didn't look at any of the other responses. Took me about 10 seconds to see pattern.
Quoting: Squonk1960

Still waiting for any justification about 72...
Quoting: Anonymous Coward 27582823

Another

Most people are responding this way:
2=6
3=12
4=20
5=30
6=42
7=56
8=72
9=90
But this is why I think it's 72:
3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8= 72!!!!!!!!!

Quoting: Anonymous Coward 49763587

Sorry to be there but you're cheating with your 1st post. 9=72 would be correct IF
3=6
4=12
5=20
6=30
7=42
2=6
3=12
4=20
5=30
6=42
We have 9=72
Quoting: Anonymous Coward 27582823

Again

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72

Not cheating...
Anonymous Coward
User ID: 34388912
United States
11/15/2013 10:36 PM
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Re: Only for geniuses!
I don't know if this has been posted before. There is a math problem (joke?) that has been stirring a debate. Originated on Facebook and driving some crazy lol.

Can any of you on here come to the solution for this pattern(Pi?AR?). And if this has been answered what is the correct one? Thanks!

IF: 2=6
3=12
4=20
5=30
6=42
Then:9=??
Quoting: Anonymous Coward 49763587

Too easy. 90
Anonymous Coward (OP)
User ID: 49763587
United States
11/15/2013 10:37 PM
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Re: Only for geniuses!
Multiplying it going from bottom up not top down L shaped pattern..IDK
Anonymous Coward
User ID: 4396096
United States
11/15/2013 10:39 PM
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Re: Only for geniuses!
2=6
3=12 (12 is 6+6)
4=20 (20 is 12+8)
5=30 (30 is 20+10)
6=42 (42 is 30+12)
9=56 (56 is 42+14)
Anonymous Coward (OP)
User ID: 49763587
United States
11/15/2013 10:39 PM
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Re: Only for geniuses!
Multiplying it going from bottom up not top down L shaped pattern..IDK
Quoting: Anonymous Coward 49763587

That's how another said they came to 72 but that seems to give the sum of 8 not 9
Anonymous Coward
User ID: 27582823
France
11/15/2013 10:42 PM
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Re: Only for geniuses!
...

2*3
3*4
4*5
5*6
6*7
7*8
8*9
9*0

Actualisation:

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

As I said, my kind of girl...
Quoting: Anonymous Coward 27582823

This breaks down if you keep going.
Quoting: ProNerd

...

2*3
3*4
4*5
5*6
6*7
7*8
8*9
9*0

Actualisation:

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

As I said, my kind of girl...
Quoting: Anonymous Coward 27582823

This breaks down if you keep going.
Quoting: ProNerd

2 * (3 modulo 10) = 6
3 * (4 modulo 10) = 12
4 * (5 modulo 10) = 20
5 * (6 modulo 10) = 30
6 * (7 modulo 10) = 42
This a match.
and 9 * (10 modulo 10) = 0
Quoting: Anonymous Coward 27582823

so...
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*-1=-10
11*-2=-22
12*-3=-36

or

2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
0*-1=-0
-1*-2=2
-3*-3=9

I'm saying that if you continue your pattern it fails to plot a constant curve.

an in....

IF: 2=6
3=12 6+6
4=20 12+8
5=30 20+10
6=42 30+12
7=56 42+14
8=72 56+16
9=90 72+18
10=110 90+20
11=132 110+22
12=156 132+24
13=182 156+26

or

2x3=6
3x4=12
4x5=20
5x6=30
6x7=42
7x8=56
8x9=64
9x10=90
10x11=110
11x12=132
12x13=156
13x14=182

these are the two simple patterns I see, both indicate 9=90
Quoting: ProNerd

90 have been given from the start.

You're wrong two times,
1) you say :
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*-1=-10
11*-2=-22
12*-3=-36

This is not my definition, it is :
f(n)=n*((n+1) mod 10)), meaning :
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*1=10
11*2=22
12*3=36

And even if it was, the fact that the definition is verified for 2,3,4,5,6 validate the definition, wich is the question asked. Nobody asked the solution must be a constant curve or anything else, it have to verify
2->6
3->12
4->20
5->30
6->42

That's all
Anonymous Coward
User ID: 49996919
United States
11/15/2013 10:43 PM
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Re: Only for geniuses!
90
Anonymous Coward
User ID: 27582823
France
11/15/2013 10:43 PM
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Re: Only for geniuses!
...

Still waiting for any justification about 72...
Quoting: Anonymous Coward 27582823

Another

Most people are responding this way:
2=6
3=12
4=20
5=30
6=42
7=56
8=72
9=90
But this is why I think it's 72:
3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8= 72!!!!!!!!!

Quoting: Anonymous Coward 49763587

Sorry to be there but you're cheating with your 1st post. 9=72 would be correct IF
3=6
4=12
5=20
6=30
7=42
2=6
3=12
4=20
5=30
6=42
We have 9=72
Quoting: Anonymous Coward 27582823

Again

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72

Not cheating...
Quoting: Anonymous Coward 49763587

lol... look yourself your bold characters, 72 is for 8 here
Anonymous Coward
User ID: 49996919
United States
11/15/2013 10:44 PM
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Re: Only for geniuses!
90
Quoting: Anonymous Coward 49996919

42 + 14 + 16 + 18 = 90
ProNerd

User ID: 13856469
United States
11/15/2013 10:45 PM
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Re: Only for geniuses!
Again

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72

Not cheating...
Quoting: Anonymous Coward 49763587

YES this is cheating, we are looking for 9 not 8, you have to keep going. We are starting with 2 not 3. :)

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72
10x9=90
Anonymous Coward
User ID: 17260532
11/15/2013 10:48 PM
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Re: Only for geniuses!
Again

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72

Not cheating...
Quoting: Anonymous Coward 49763587

YES this is cheating, we are looking for 9 not 8, you have to keep going. We are starting with 2 not 3. :)

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72
10x9=90
Quoting: ProNerd

you really are a pro nerd lol
xtcsso

User ID: 49620053
11/15/2013 10:48 PM

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Re: Only for geniuses!
I don't know if this has been posted before. There is a math problem (joke?) that has been stirring a debate. Originated on Facebook and driving some crazy lol.

Can any of you on here come to the solution for this pattern(Pi?AR?). And if this has been answered what is the correct one? Thanks!

IF: 2=6
3=12
4=20
5=30
6=42
Then:9=??
Quoting: Anonymous Coward 49763587

2x3
3x4
4x5
5x6
6x7
7x8
8x9
9x10

90...
xtcsso
xtcsso

User ID: 49620053
11/15/2013 10:49 PM

Report Abusive Post
Re: Only for geniuses!
I don't know if this has been posted before. There is a math problem (joke?) that has been stirring a debate. Originated on Facebook and driving some crazy lol.

Can any of you on here come to the solution for this pattern(Pi?AR?). And if this has been answered what is the correct one? Thanks!

IF: 2=6
3=12
4=20
5=30
6=42
Then:9=??
Quoting: Anonymous Coward 49763587

2x3
3x4
4x5
5x6
6x7
7x8
8x9
9x10

90...
Quoting: xtcsso

an yes like so many i reply before seeing all reply lol
xtcsso
Anonymous Coward
User ID: 27582823
France
11/15/2013 10:49 PM
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Re: Only for geniuses!
2=6
3=12 (12 is 6+6)
4=20 (20 is 12+8)
5=30 (30 is 20+10)
6=42 (42 is 30+12)
9=56 (56 is 42+14)
Quoting: Anonymous Coward 4396096

2=6
3=12 (12 is 6+6)
4=20 (20 is 12+8)
5=30 (30 is 20+10)
6=42 (42 is 30+12)
7=56 (56 is 42+14)
8=72 (72 is 56+16)
9=90 (90 is 72+18)

you just forgot 7 & 8
Anonymous Coward (OP)
User ID: 49763587
United States
11/15/2013 10:50 PM
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Re: Only for geniuses!
Again

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72

Not cheating...
Quoting: Anonymous Coward 49763587

YES this is cheating, we are looking for 9 not 8, you have to keep going. We are starting with 2 not 3. :)

3x2=6
4x3=12
5x4=20
6x5=30
7x6=42
8x7=56
9x8=72
10x9=90
Quoting: ProNerd

These are not my equations simply providing how some are saying they get 72 I did post that it gave the sum for 8 not 9. If it were I doing it, I think I would leave the digits 7 and 8 out of it, that would be cheating as they are not given.
Anonymous Coward
User ID: 17260532
11/15/2013 10:51 PM
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Re: Only for geniuses!
Reminder for new page and new comers. Correct answers so far

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)
and give f(9)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

There is also a strange cabal which insist saying 72 is correct but failing to define f(n).
Quoting: Anonymous Coward 27582823

you god damn french man doing things all long and drawn out and shit.. whats with all the algebraic non-sense.. couldn't you just see the pattern at a first glance or what?
Anonymous Coward
User ID: 4396096
United States
11/15/2013 10:52 PM
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Re: Only for geniuses!
2=6
3=12 (12 is 6+6)
4=20 (20 is 12+8)
5=30 (30 is 20+10)
6=42 (42 is 30+12)
9=56 (56 is 42+14)
Quoting: Anonymous Coward 4396096

2=6
3=12 (12 is 6+6)
4=20 (20 is 12+8)
5=30 (30 is 20+10)
6=42 (42 is 30+12)
7=56 (56 is 42+14)
8=72 (72 is 56+16)
9=90 (90 is 72+18)

you just forgot 7 & 8
Quoting: Anonymous Coward 27582823

No, I did not forgot anything.
Anonymous Coward
User ID: 17260532
11/15/2013 10:52 PM
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Re: Only for geniuses!
Anyone who got 90 will be contacted by the nsa code breaker team.. thanks for playing
g0ld3nb0y

User ID: 33039683
United States
11/15/2013 10:57 PM
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Re: Only for geniuses!
Anyone who got 90 will be contacted by the nsa code breaker team.. thanks for playing
Quoting: Anonymous Coward 17260532

Or maybe you'll be contacted by Team Sebelius. I heard they're looking for some geniuses.
g0ld3nb0y
ProNerd

User ID: 13856469
United States
11/15/2013 11:04 PM
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Re: Only for geniuses!
90 have been given from the start.

You're wrong two times,
1) you say :
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*-1=-10
11*-2=-22
12*-3=-36

This is not my definition, it is :
f(n)=n*((n+1) mod 10)), meaning :
2*3=6
3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72
9*0=0
10*1=10
11*2=22
12*3=36

And even if it was, the fact that the definition is verified for 2,3,4,5,6 validate the definition, wich is the question asked. Nobody asked the solution must be a constant curve or anything else, it have to verify
2->6
3->12
4->20
5->30
6->42

That's all
Quoting: Anonymous Coward 27582823

Agreed, please I am not saying you are wrong, your math is sound. I am using extrapolation and looking for the best pattern match ie constant curve given the initial data set. I tend to process numbers in a graphical and even colorful way. But I like the way you processed it as well.
Anonymous Coward
User ID: 27582823
France
11/15/2013 11:04 PM
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Re: Only for geniuses!
Reminder for new page and new comers. Correct answers so far

If f(2)=12, f(3)=12, f(4)=20, f(5)=30, f(6)=42, define f(n)
and give f(9)

a) f(n)=n*(n+1)
so f(9)=9*10=90

b) with [n] = nth prime number, f(n)=[n]+[2n-2]
so f(9)=[9]+[2*9-2]=23+[16]=23+53=76

c) f(n) = n * ((n+1) modulo 10))
so f(9) = 9 * (10 modulo 10) = 9 * 0 = 0

There is also a strange cabal which insist saying 72 is correct but failing to define f(n).
Quoting: Anonymous Coward 27582823

you god damn french man doing things all long and drawn out and shit.. whats with all the algebraic non-sense.. couldn't you just see the pattern at a first glance or what?
Quoting: Anonymous Coward 17260532

Hi Canada, nice meeting you. The only pattern I see concerning 72 is there is a cabal here trying to get me doubting my sanity. I understand I post too much and I apology about that but this is also your fault. If someone give a correct 72 answer I will add it to the list and stay quiet. I have to believe you on word that 72 is correct ? All 72 answers have been un-justified or 'debunked' so far.
Anonymous Coward
User ID: 50023016
11/15/2013 11:05 PM
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Re: Only for geniuses!
( + ^^

The Clowns
User ID: 30400765
United States
11/15/2013 11:05 PM
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