Identify the missing letter in the series: Z, X, V, T, ?

A. R

How many times does the letter 'E' appear in the series: A, B, C, D, E, F, G, E, H, I, E?

B. 3

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