Question

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, so HCF of 4 and 15
is 0. Is the answer correct? If not, what is the correct HCF?

Answer 1

Hi !

Zero is not the HCF

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4 = 2 x 2

15 = 3 x 5

or

4 = 2 x 2 x 1

15 = 3 x 5 x 1

HCF = 1

HCF of 2 co prime numbers is always 1