If the 1st letter is A and the 26th letter is Z, what is the 10th letter?

A. I

Find the odd one out in the series: A, D, G, J, M, P, S, ?

B. U

In the sequence B, D, F, H, J, what is the 5th letter?

C. J

What is the next letter in the series: K, M, O, Q, ?

A. R

What is the missing number in the series: 2, 6, 12, 20, ?, 42

B. 32