Exams › SSC CGL (Prelims) › General

What should come at the place of the question mark? 3, 7, 15, 31, 63, ?

1. 95
2. 127
3. 111
4. 123

Correct answer: 127

Solution

Each term is obtained by doubling the previous term and adding 1: 3→7→15→31→63. So the next term is 63×2+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, ?
• Choose the odd one out:
• Complete the pattern: 120, 96, 76.8, 61.44, ?

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