Exams › SSC CGL (Prelims) › General

What number completes the series: 3, 6, 13, 28, ?

1. 55
2. 57
3. 59
4. 61

Correct answer: 59

Solution

The pattern is: multiply by 2 and add 0, 1, 2, 3, ... respectively. So, 3 × 2 = 6, 6 × 2 + 1 = 13, 13 × 2 + 2 = 28, and 28 × 2 + 3 = 59.

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