What number should replace the question mark in the series: 1, 1, 2, 3, 5, ?

B. 7

What is the missing number in the series: 3, 6, 12, 24, ?

B. 48

What is the missing term in the series: 3, 6, 11, 18, ?, 42?

B. 26

Identify the missing number in the series: 12, 24, 48, ?, 192.

A. 96

What is the missing number in the series: 2, 4, 8, 16, ?, 64

B. 32