Which is not a part of the Oracle database

If 32 @ 10 = 32 and 42 @ 30 = 76, then 28 @ 56 = '?'.

If 87 # 95 = 101 and 48 # 84 = 64, then 68 # 87 = ? 

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

Expand: Enlarge :: Reduce: ?

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

PRAYER: 77 :: MALLOW : ?

Four letter-pairs have been given, out of which three are alike in some manner and one is different. Select the letter-pair that is different.

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

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

45: ? :: 58: 377

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

67 : 96 :: 45 : ?