1.

In each of the following number series, the wrong number is given, find out that number.1, 5, 20, 57, 121, 221, 3651. 572. 203. 1214. 55. 365

Answer» Correct Answer - Option 2 : 20

Given:

The given number series is:

1, 5, 20, 57, 121, 221, 365

Concept Used:

A number series, with the relation between successive terms.

Calculation:

The given number series follows the relation:

1 + 22 = 5,

5 + 42 = 21,

21 + 62 = 57,

57 + 82 = 121, 

121 + 102 = 221,

221 + 12= 365

The wrong number in the given series is 20



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