Find Missing Number

TheSeeker · #1 (**permalink**) 08-24-2008

Fill in the missing number in the series.
3,10,7,8,--,12,9,16.

Sushma Mosali · #2 (**permalink**) 08-24-2008

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.

Thanks
Sushma

alagusugi · #3 (**permalink**) 10-03-2008

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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Find Missing Number

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