In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 14, 28, 20, 40, 32, 64, . . .What number should come next ?

B. 56

In following questions, one term in number series is incorrect. - Find out the incorrect number 24, 27, 31, 33, 36

C. 31

What terms will fill the blank spaces ?
Z, X, V, T, R, (....), (....)

E. P, N

In following questions, one term in number series is incorrect. - Find out the incorrect number 8, 14, 26, 48, 98, 194, 386

B. 48

In following number series, either one term is missing or is incorrect. - Choose correct answer from options 2, 3, 5, 8, 13, 34

A. 21