In a series of numbers: 2, 4, 8, 16, ?, 64. What is the missing number?

B. 32

In a series of numbers: 2, 4, 8, 16, ?, 64, what is the missing number?

B. 32

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

A. Z

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

A. P

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

A. D