Find the missing number in the series: 5, 11, 23, 47, ?, 191

C. 97

Find the missing term in the series: 1, 1, 2, 3, 5, ?, 21.

A. 8

What number should replace the question mark in the series: 1, 3, 6, 10, ?, 21?

B. 15

What number should replace the question mark in the series: 1, 4, 9, 16, ?

B. 25

What number should replace the question mark in the series: 2, 4, 8, 16, ?

C. 32