In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options. - DEF, HIJ, MNO, ?

A. STU

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. - aa _ ab _ _ aaa _ a

A. AAAB

In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options. - shg, rif, qje, pkd, ?

B. OLC

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. - _ bc _ _ bb _ aabc

A. ACAC

In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 21, 9, 21, 11, 21, 13, . . .What number should come next?

C. 21