If the pattern is M, N, O, ?, Q, R, what letter should replace the question mark?

A. P

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

A. 16

In the sequence A, B, C, D, ?, F, G, what character should replace the question mark?

A. E

In the pattern: X, Y, Z, A, ?, C. What is the missing letter?

A. B

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

A. 16