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Which of the following pairs are co-prime (their only common factor is 1)?

Class 6Factors and MultiplesPlaying with Numbers

A8 and 12
B9 and 16
C6 and 15
D10 and 25

Step-by-Step Solution

9 =

3 \times 3

and

16 = 2 \times 2 \times 2 \times 2

share no common factor except 1, so they are co-prime.

Answer: B) 9 and 16

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