This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Factors of p= 1, p
Factors of q= 1, q
Thus their hcf will be 1.
1 4 1
If p and q are both primes, then their factors are 1 and the number itself. So the only common factor is 1. Hence HCF will be 1.

Not only for two primes, the HCF of any number of prime numbers is always 1.