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

C. 97

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

B. 25

What is the next number in the series: 3, 7, 15, 31, ?

A. 63

If the 3rd letter is C, what is the 6th letter in the sequence of the alphabet?

B. E

What number should replace the question mark in the series: 8, 27, 64, ?, 216

A. 125