In the series: 1, 4, 9, 16, ?, 36. What is the missing number?

B. 25

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

A. 16

What character should replace the question mark in the pattern X, Y, Z, ?, B, C?

A. A

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

B. 32

In a pattern of letters: X, Y, ?, Z, A. What is the missing letter?

A. W