1, 3, 7, 15, ?, 63, 127
Answer & ExplanationOption: [D]
The pattern is
21 - 1 = 1
22 - 1 = 3
23 - 1 = 7
24 - 1 = 15
25 - 1 = 31
26 - 1 = 63
27 - 1 = 127
So, 31 will replace the question mark.
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