Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?
AB_AB_AA_BB_

5, 7.5, 12.5, 22.5, ?

In the following question, select the word which cannot be formed using the letters of the given word.
CAPABILITIES

Which letter-cluster will replace the question mark (?) to complete the given series?

MU, NE, PX, QF, SA, TG, ?

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

Rearrange the jumbled letters to make a meaningful word and then select the one which is different.

A series is given, a term is missing in series. Choose the correct alternative from the given ones that will complete the series.
I, V, ? , L

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