In the series A, C, E, G, I, what is the 4th letter?

A. G

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