Question

Question 3

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

Answer 1

HCF of 4 and 15 is not 0 but 1.
1 is always a common factor between any numbers.
Hence, the correct HCF is 1.