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Question

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


A
31
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B
15
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C
56
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D
91
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Solution

The correct option is B 91

The 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 91


Logical Reasoning

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