In the sequence: X, Y, ?, A, B, what letter should replace the question mark?

A. Z

In the sequence: M, N, O, ?, Q, what letter is missing?

A. P

What character should be placed in the blank: X, Y, Z, A, B, ?

A. C

Find the missing character in the pattern: 2, 4, 8, ?, 32.

A. 16

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

A. E