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Choose or find odd number pair

(21 - 6) , (28 - 42) , (42 - 12) , (84 -24)

Option:
A. 21 - 6
B. 28 - 42
C. 42 - 12
D. 84 -24
Answer: B . 28 - 42

Justification: In all other pairs, 1st number = 2nd number × 7/2

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