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Q.

If the HCF of two numbers is 1, then they are called as Co-prime numbers

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a

True

b

False

answer is A.

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Detailed Solution

Let us take two numbers  4 and 15.

Factors of 4 are 1,2,4

Factors of 15 are 1,3,5,15

Their common factor is 1.

Hence, HCF 4,15 is 1.

If the HCF of two numbers is 1, then they are called co-prime numbers.

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