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

A. P

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

A. E

In a pattern of symbols: ?, ???, ?????, ?, ????????. What is the missing symbol?

C. ???????

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

A. D4

In the series 2, 4, 6, ?, 10, what is the missing number?

A. 8