In a sequence of letters: A, C, E, G, ?, K. What is the missing letter?

B. H

If the pattern is 1, 2, 4, ?, 16, 32, what number should replace the question mark?

A. 8

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

B. H

In the pattern 1, 3, 5, ?, 9, 11, what is the missing number?

B. 7

In the series: 1, 4, 9, ?, 25, what number should replace the question mark?

A. 16