Find the missing number in the series: 1, 4, 9, 16, ?, 36

B. 25

What number should replace the question mark in the series: 3, 6, 11, 18, ?, 42

C. 29

Identify the missing number in the series: 5, 10, 20, 40, ?, 160

C. 80

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

B. 8

Identify the missing number in the series: 5, 10, 20, 40, ?, 160.

A. 80