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

B. 12

In the pattern 5, 10, 15, ?, 25, what number is missing?

A. 20

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

A. 8

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

A. 12

What character should replace the question mark in the sequence: A, B, C, ?, E?

A. D