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Question

HCF of co-prime numbers $$4$$ and $$15$$ was found as follows by factorisation: $$4=2\times 2$$ and $$15=3\times 5$$ 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?

Solution
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No, the answer is not correct.
$$1$$ is the correct HCF.

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HCF of co-prime numbers 4 and 15 was found as follows by factorisation: 4=2×2 and 15=3×5 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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