What letter should come next in the series: a, c, e, g, ?

B. H

What letter comes next in the series: M, O, Q, S, ?

A. T

What is the next number in the series: 12, 24, 48, 96, ?

A. 192

What is the missing number in the series: 100, 90, 80, 70, ?, 50

A. 60

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

B. J