Question

# Find the wrong number in the series.1, 2, 6, 15, 31, 56, 91

A
31
B
15
C
56
D
91

Solution

## The correct option is B 91The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35.This is clearly , $$+1^2, +2^2, +3^2, +4^2, +5^2, +6^2$$Here 35 is wrong, So our wrong number is 91Logical Reasoning

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