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Find Missing Number

This is a discussion on Find Missing Number within the Brainteasers forums, part of the Brain Gym category; Fill in the missing number in the series. 3,10,7,8,--,12,9,16....


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Old 08-24-2008
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Find Missing Number

Fill in the missing number in the series.
3,10,7,8,--,12,9,16.
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Old 08-24-2008
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Re: Find Missing Number

hi,

the missing number is 7.



Sol 1.

3 10 7 8 -- 12 9 16

so, lets name them as

a=3, b=10, c=7, d=8, e=?, f=12, g=9, h= 16

a+9 gives you f(12), and b-1 gives you g(9), adn c+9 gives you h(16), so in that fashion d-1, should give you e, which will be 7 as the value of d=8.

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Sushma
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Old 10-03-2008
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Re: Find Missing Number

3, 10, 7, 8
3*2, 10+2, 7+2, 8*2
6, 12, 9, 16
So the missing number is 6
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