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

B. 25

What character completes the pattern: X, Y, Z, A, B, ?

A. C

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

A. 16

What character should be inserted in the sequence X, Y, ?, A, B, C?

A. Z

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

B. H