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Three of the following number pairs are alike in some manner and one is different. Select the odd number pair. (NOTE: The second number in the given
Question

Three of the following number pairs are alike in some manner and one is different. Select the odd number pair.
(NOTE: The second number in the given number pairs is formed by performing a certain operation on the first number The same operation is followed in all the number pairs except one. Find that odd number pair.)

A.

297:33

B.

189:21

C.

100:12

D.

63:7

Correct option is C

Logic: all first number completely divided by second numbers in 9 times except option c.
(a) 297:33 → 297 ÷ 33 = 9
(b) 189:21 → 189 ÷ 21 = 9
(c) 100:12 → 100 ÷ 12 = 8.33
(d) 63:7 → 63 ÷ 7 = 9 
Thus,  the odd one out is option (c).

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