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Choose or find odd number pair

(56 - 8) , (121 - 17) , (147 - 21) , (168 - 24)

Option:
A. 56 - 8
B. 121 - 17
C. 147 - 21
D. 168 - 24
Answer: A . 127 - 17

Justification: In all other pairs, the first number is seven time the second number.

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