In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
3, 7, 15, 31, 63,
A
92
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B
115
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C
127
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D
131
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Solution
The correct option is C 127 Each number in the series is the preceding number multiplied by 2 and then increased by 1. Thus, (3 * 2) + 1 = 7, (7 * 2) + 1 = 15, (15 * 2) + 1 = 31 ans so on. ∴ Missing Number = (63 * 2) + 1 =127.