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HCF of co-prime numbers 4 and 15 was ...

HCF of co-prime numbers 4 and 15 was found as follows by factorisation : and since there is no common prime factor, so HCF of 4 and 15 is 0. Is the answer correct? If not, what is the correct HCF?

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H.C.F.of co-prime numbers 4 and 15 was found as follows: 4=2x2 and 15=3x5 since there is no common prime factor.So, H.C.F.of 4 and 15 is 0. Is the answer correct? If not,what is the correct H.C.F.?

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