Identify the missing character in the series 1, 4, 9, ?, 25, 36.

A. 16

In a sequence of letters: A, C, E, G, ?, K, M, O, what is the missing letter?

B. H

Bird is to Nest as Fish is to ?

B. AQUARIUM

In the pattern: X, Y, Z, ?, B, what character is missing?

A. A

Identify the missing character in the series 1, 4, 9, ?, 25. What is the missing character?

A. 16