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Choose or find odd number pair

(45 - 27) , (30 - 18) , (20 - 10) , (15 - 12)

Option:
A. 45 - 27
B. 30 - 18
C. 20 - 10
D. 15 - 12
Answer: C . 20 - 10

Justification: In all other pairs, the two number have 3 as the common factor.

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