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

RLV, PNS, NPP, ?, JTJ

Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E. g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(63, 81, 7)
 (84, 49, 12)

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 son of B’
 If A + B & C – D + E, then how is A related to E?

Select the option that is related to the fifth word in the same way as the second word is related to the first word and the fourth word is related to the third word.
 Water : Thirst :: Food : Hunger :: Rest : ? 

If  ‘+’  means ‘÷’,   ‘ ̶ ’  means  ‘+’,   ‘×’ means  ‘ ̶ ’  and   ‘÷’  means  ‘×’,   what will be the value of the following expression?
 [{(38 × 23) - (4 ÷ 3)} + (6 - 3)] ÷ 2

Given below is a question followed by two statements I and II. Read both the statements carefully to decide which one of them is sufficient to answer the question. Six people - K, M, N, P, Q and R are sitting around a circular table facing the centre. Who sits to the immediate right of K?

(I) K sits third to the left of M. Only one person sits between K and N. R sits to the immediate left of N.
 (II) K sits second to the right of Q. Only two people sit between K and M. P sits second to the left of R.

Which of the following numbers will replace the question mark (?) in the given series?
 1331, 2197, ?, 6859

In a certain code language, '471' means 'Hair is White', '726' means 'White Her Cow', and '639' means 'Cow gives Milk'. What is the code for 'Her' in that language?