Bunuel wrote:

Hobbit20 wrote:

what if x & y are negative?

x and y cannot be negative because it's given in the stem that they are primes and only positive integers can be primes.

Check for more here:

https://gmatclub.com/forum/math-number- ... 88376.htmlHope it helps.

Why prime numbers need to be always positive?

-2,-3,-5 also have 1 and the number itself as factor.

Then why can't we consider them prime?

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