The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs except one. Find that odd number pair. 

Select the option that is related to the third term in the same way as the second term is related to the first term and the sixth term is related to the fifth term.
 16 : 69 :: 24 : ? :: 31 : 144 

Select the option that is related to the third number in the same way as the second number is related to the first number.

35 : 64 :: 29 : ?

Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.

PV : MQ :: FB : ?

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. 

Pitch : Cricket :: Court : Badminton :: Ring : ?

Select the option in which the pair of letter-clusters share the same relationship as that shared by the given pair of letter clusters.

ROP : NMP :: ?

Select the option that is related to the sixth number in the same way as the first number is related to the second number and the third number is related to the fourth number.
34 : 12 :: 28 : 16 :: ? : 15

Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.

(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 /deleting /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)

2 : 6 :: 4 : 60 :: 7 : ?