# What is the missing number?

• Apr 29th 2010, 09:10 PM
Jerick
What 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, 04:13 AM
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, 04:19 AM
Wilmer
Quote:

Originally Posted by jerick
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

hint:
6 - 1 = 5, 14 - 9 = 5
6 - 3 = 3, 12 - 9 = 3
7 - 3 = 4, 11 - 7 = 4
• Apr 30th 2010, 04:33 AM
Quote:

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

This doesn't look correct (Thinking)

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

__________________
Sorry if I am wrong in guessing from your hint.
• Apr 30th 2010, 07:27 AM

Wilmer, shouldn't you have said

7-3=12-?

a bit of a symptom of Adarsh's method though
• Apr 30th 2010, 08:25 AM
Wilmer
Well, who cares...EIGHT is the answer (Wait)

Apologies; not enough coffee...
• Apr 30th 2010, 08:46 AM
Quote:

Well, who cares...11 is the answer
Well I 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, 04:38 PM
Bacterius
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, 05:25 PM
Jerick

Or: (x-1)(x-6)(x-3)(x-7)(x-?)(x-12)(x-9)(x-14)=0
• May 3rd 2010, 03:24 AM
Swlabr
Quote:

Wilmer, shouldn't you have said

7-3=12-?

a bit of a symptom of Adarsh's method though

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.

Quote: