Exams › SSC CGL (Prelims) › General
Find the next number in the series: 3, 7, 15, 31, 63, ?
- 95
- 125
- 127
- 131
Correct answer: 127
Solution
The pattern is doubling and adding 1: 3, 7, 15, 31, 63. Equivalently, these are 2²−1, 2³−1, 2⁴−1, 2⁵−1, 2⁶−1, so the next term is 2⁷−1 = 127.
Related SSC CGL (Prelims) General questions
- What comes in place of (?) in the series: 2, 6, 18, 54, ?
- What comes next? 8, 20, 44, 92, ?
- One number does not fit into the given factorial series. Identify it: 3, 6, 24, 120, 720, 800.
- What should come at the place of the question mark (?) in the following series? 2, 3, 8, 9, 26, 27, ?
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