Hi Sonali ,

I believe this question is not a series question but an odd one out question.

Here the odd one out would be hu , here is why :

hu is the only form of word which contains alphabets who are not opposite to eachother.

AZ

BY

CX

DW

EV

FU

GT

HS

IR

JQ

KL

LO

MN

All the rest of the words are in here except hu  , hence the answer would be hu.

Good Luck..!