Choose the co-prime numbers from the following pairs

7 a n d 63

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39 a n d 25

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35 a n d 21

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63 and 81

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Solution

The correct option is B $39 a n d 25$
A set of numbers which do not have any other proper common factor other than $1$ are called co-prime.
Given numbers are $39 a n d 25$
$39 = 3 \times 13$
$25 = 5 \times 5$
HCF $= 1$

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Which of the following pairs of numbers are co-primes?
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