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Choose or find odd number pair

(3 - 12) , (4 - 20) , (6 - 42) , (7 63)

Option:
A. 3 - 12
B. 4 - 20
C. 6 - 42
D. 7 63
Answer: D . 7 - 63

Justification: In all other pairs, (1st number) × (1st number + 1) = 2nd number.

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