Verbal Reasoning - Mental Ability Questions

RHYTHM is related to MUSIC in the same way as DESIGN is related to

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

9 , 21, 45, 93, ? , 381

Select the related word from the given alternatives.
Plane : Pilot :: Ship : ?

MATHEMATICS is related to NUMBERS in the same way HISTORY is related to

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

5, 8, 12, 17, 23, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
DP, EY, FJ, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

GHXT, JKUQ, MNRN, PQOK, ?

Select the missing number?