What is the number that goes where the question mark is?

{ 1, 6, 3, 7, ?, 12, 9, 14 }

possible numbers: 4, 7, 8, 10, 11, 13

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- Apr 29th 2010, 10:10 PMJerickWhat is the missing number?
What is the number that goes where the question mark is?

{ 1, 6, 3, 7, ?, 12, 9, 14 }

possible numbers: 4, 7, 8, 10, 11, 13 - Apr 30th 2010, 05:13 AMADARSH
ANs is 8

Sum of 1st and last term = 15

Sum of 2nd and second last = 15

7+? = 15

? = 8

Game Over XXX - Apr 30th 2010, 05:19 AMWilmer
- Apr 30th 2010, 05:33 AMADARSHQuote:

hint:

6 - 1 = 5, 14 - 9 = 5

6 - 3 = 3, 12 - 9 = 3

7 - 3 = 4, 11 - 7 = 4

If 11 is taken as answer than

1......(add5)......6......(substract3)......3..... (add 4).....7.......(add4)....11....(add1)....12....(su bstract3).....9.....(add5)......14

This doesn't look correct (Thinking)

How do you explain that (add1) in b/w 11 and 12?

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Sorry if I am wrong in guessing from your hint. - Apr 30th 2010, 08:27 AMArchie Meade
Hi Adarsh, Wilmer...

Wilmer, shouldn't you have said

7-3=12-?

a bit of a symptom of Adarsh's method though - Apr 30th 2010, 09:25 AMWilmer
Well, who cares...EIGHT is the answer (Wait)

Apologies; not enough coffee... - Apr 30th 2010, 09:46 AMADARSHQuote:

Well,**who cares**...11 is the answer

**do care**and I am sure OP also does...... and if I am not wrong we all in MHF do care to do correct things by currect method.

And No its still 8.

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Sorry for being rude but that statement doesn't suit you. - Apr 30th 2010, 05:38 PMBacterius
I say all possibilities suit the pattern, because I found that the pattern rule was that "

*they are all numbers*".

Jokin', the answer should be 8, if the OP could now confirm if the puzzle has been solved ? - Apr 30th 2010, 06:25 PMJerick
Yep, the answer is 8.

Or: (x-1)(x-6)(x-3)(x-7)(x-?)(x-12)(x-9)(x-14)=0 - May 3rd 2010, 04:24 AMSwlabr
I thought Wilmer's hint was quite neat. I was, as he said, a hint, and so hinted towards Adarsh's solution. Small typo, but that is beside the point.

I propose that the number is not 8, instead it is 426/35. There is a perfectly logical sequence which goes 1, 6, 3, 7, 426/35, 12, 9, 14... I challenge you to find it.

(My point is that no, it doesn't matter!)