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Guess the next number in the following Series?

+3 votes
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Series: 2, 15, 13, 12, 12, 11, 11, ?
Guess the ?

posted Jan 7, 2014 by Amit Mishra

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1 Answer

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Heading ##Total count is even. Missing number (?) is 8th which can be calculated by using logic:

Subtract the middle one's, then their neighbour digits. So, the missing number be:
case1:
12-12 = 0
13-11= 2
15-11= 4
2- (?) = 6

case2:
12-12= 0
11-13= -2
11-15= -4
(?)- 2 = -6

which comes -4 in both the cases.

so, the final series is: 2, 15, 13, 12, 12, 11, 11, -4

answer Feb 6, 2014 by Gurpreet Singh Matharoo
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