Find the missing character in the series: M, N, O, ?, Q, R.

A. P

In the sequence 2, 4, 8, ?, 32, 64, what is the missing number?

A. 16

Find the missing character in the series A1, B2, C3, ?, E5.

A. D4

If the pattern is 1, 2, 4, 7, ?, 16, what number should replace the question mark?

B. 11

In the series X, Y, Z, A, ?, C, D, what character should fill the gap?

A. B