Question

find the HCF of all prime numbers

Answer 1

prime numbers are those numbers who have factors as 1 and number itself 
as there is only one common factor in all prime numbers and that is 1
the HCF all prime numbers is 1

Answer 2

Hi friend,

Here is your answer,
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HCF - Highest common factor

All the number (including the prime numbers) have 1 as the factor. So the highest common factor of all the prime numbers is 1.

And hence the HCF of all prime numbers is 1.
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