Identify the missing letter in the pattern: A, C, E, ?, I.

A. G

In a series of letters: M, O, Q, S, ?, Y. What is the missing letter?

A. T

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

A. 16

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