The co-prime numbers from the following pairs, are ______.

7 and 63

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36 and 25

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35 and 29

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63 and 81

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Solution

The correct options are
B 36 and 25
C 35 and 29
If the H.C.F of two numbers are $1$ they are said to be co-prime
(A) HCF (7, 63) = 7
(B) HCF (36, 25) = 1
(C) HCF (35, 29) = 1
(D) HCF (63, 81) = 9
So, 36 & 25 and 35 & 29 are co-prime numbers.

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