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

REV, UXD, XQL, AJT, ?

A + B means ‘A is the father of B’
A – B means ‘A is the mother of B’
A % B means ‘A is the brother of B’
A # B means ‘A is the daughter of B’
If P + Q % R % S # T – U, then how is Q related to U?

Four clusters have been given out of which three are alike in some manner and one is different. Select the one that is different.

Option

Four clusters have been given out of which three are alike in some manner and one is different. Select the one that is different.

Option

P, Q, R, S, T, U, V and W are sitting at a round table and facing the centre. P is second to the right of T and is the neighbor of T, R and V. S does not sit near to P and V and U are sitting nearby. Q is not between S and W and W is not between U and S. Who are not neighbors among themselves -

By interchanging the given two signs and numbers which of the following equation will be not correct?
 ÷ and ×, 1 and 3

Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/numbers of consonants/vowels in the word)
 Race : Track

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

TMT, ZOB, FQJ, LSR, ?