What number should come next?
1, 3, 7, 15, 31, ?
Correct Answer: Option A
We have the terms of the given series as
⇒ 21 – 1 = 1
⇒ 22 – 1 = 3
⇒ 23 – 1 = 7
⇒ 24 – 1 = 15
⇒ 25 – 1 = 31
⇒ ? = 26 – 1 = 63
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