Verbal Reasoning - Mental Ability Questions

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

Select the missing number?

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

5, 7.5, 12.5, 22.5, ?

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

Choose the related word/letters/number from the given alternatives. CD : 916 : : ? : 100144

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
2, 10, 30, 68, ?

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

ALZ,CJV,EHR,GFN,?

Introducing a girl, a man says, "She is the daughter of my father's daughter". How is the girl related to the man?