A, E, I, O, ?

A. U

In the series: 2, 4, 8, ?, 32, what number should replace the question mark?

B. 16

Identify the missing letter in the sequence: J, K, L, ?, N.

A. M

Identify the missing letter in the sequence: B, D, F, ?, J.

C. G

What character should be placed in the blank: 1, 3, 5, ?, 9?

B. 7