Exams › SSC CGL (Prelims) › General

Find the missing term: 3, 7, 15, 31, ?

1. 47
2. 63
3. 61
4. 64

Correct answer: 63

Solution

The series follows the pattern of doubling and adding 1: 3 e0 7 e0 15 e0 31 e0 63. Equivalently, the differences are 4, 8, 16, so the next difference is 32. Thus, 31 + 32 = 63.

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