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

HCF of co-prime numbers 4 and 15 was found as follows by factorisation: `4 = 2 xx 2` and `15 = 3 xx 5`. Since there is no common prime factor, HCF of 4 and 15 is 0. Is the answer correct ? If not, what is the correct HCF?

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