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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.
0 0 0
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