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Question

Select the correct alternative to replace the '?'
3 7 15 31:5 11 23 47::7 15 31 63:?

A
9 21 41 81
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B
13 31 63 127
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C
13 29 61 125
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D
9 19 39 79
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Solution

The correct option is D 9 21 41 81
First pair of the series follow a sequence :
3+2=5, 7+4=11, 15+8=23, 31+16=47.
In the same way,
7+2=9, 15+4=19, 31+8=39, 63+16=79.
Thus, the second term of the series will be 9 19 39 79.
Hence, option D is correct.

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