What character should replace the question mark in the sequence 3, 6, 9, ?, 15?

B. 12

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

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

B. 7

Find the missing character in the sequence: X, Y, ?, A, B, C.

A. Z