In a series of numbers: 2, 4, 8, 16, ?, 64. What is the missing number?

B. 32

Identify the missing letter in the sequence: B, D, F, ?, J.

C. G

In the sequence: M, N, O, ?, Q, what letter is missing?

A. P

What character should replace the question mark in the sequence: A, B, C, ?, E?

A. D

In the series: 1, 4, 9, ?, 25, what number should replace the question mark?

A. 16