In the series 1, 3, 6, 10, what is the next number?

A. 15

If the sequence is A, C, E, G, what is the next letter?

B. H

In the series 2, 4, 8, 16, what is the next number?

C. 32

Which of the following sequences follows the same rule as the sequence A, C, E, G, I?

A. B, D, F, H, J

What comes next in the pattern: A, B, D, F, H?

D. I