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Question

In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. In three of the four pairs, the same pattern is applied and hence they form a group. Select the number-pair that does NOT belong to this group.
A. 2 : 5
B. 4 : 18
C. 6 : 39
D. 8 : 66

A B

B A

C D

D C

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