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

A. 32

In the pattern A1, B2, C3, ?, E5, what should replace the question mark?

A. D4

In the sequence A, C, E, G, ?, K, M, O, what is the missing character?

B. H

What character should replace the question mark in the series: B, D, F, ?, J, L?

B. G

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

A. E