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

A. 16

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

A. D

Identify the missing letter in the pattern: J, K, L, ?, N.

B. M

What character should be placed in the blank: 2, 4, 8, ?, 32?

B. 16

In a sequence of letters: A, C, E, G, ?, K. What is the missing letter?

B. H