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

B. S

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

D. S

Z, X, V, T, ?

A. R

What is the next letter in the series: A, C, E, G, ?

A. I

Find the missing number in the series: 5, 10, 20, 40, ?

D. 80