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In each of the following number series, the wrong number is given, find out that number.

1, 2, 6, 15, 31, 55
1. 1
2. 2
3. 55
4. 16
5. 31

1 Answer

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Correct Answer - Option 3 : 55

Calculation

The series follows the following pattern

⇒ 1 + 12 = 2

⇒ 2 + 22 = 6

⇒ 6 + 32 = 15

⇒ 15 + 42 = 31

⇒ 31 + 52 = 56

∴ Wrong number of the series is 55

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