What is the next letter in the series: B, D, F, H, ?

A. J

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

A. 15

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

C. 32