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

A. P

If the pattern is 1, 2, 4, 8, ?, 32, 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 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