1.   Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
3, 7, 15, ?, 63, 127

A. 30
B. 31
C. 47
D. 52

Answer: Option B

Explanation:

Each number in the series is one more than twice the preceding number. So, missing term = (15 × 2) + 1 = 31.