(21 - 49) , (24 - 64) , (25 - 54) , (81 - 36)
Option:
Justification: This is the only pair in which the two numbers have no common factor.
Choose or find odd number pair
A. 21 - 49
B. 24 - 64
C. 25 - 54
D. 81 - 36
Answer: C . 25 - 54
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