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

A. 16

In the sequence: M, N, O, ?, Q, R. What letter is missing?

A. P

In the pattern 3, 6, 9, ?, 15, 18, what is the missing number?

B. 12

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

A. E

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

A. 16