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Math Expert
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Re: If x and y are prime numbers, then which one of the following cannot [#permalink]
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Of the available prime numbers, only 2 is an even number.
Baring this number the rest of the primes are all odd.
Also, the difference between two odd number cannot be odd.

13 can be achieved only by subtracting 2 from an odd number(which is 15)
But, 15 in not prime. (Hence x-y = 13 is not possible) (Option C)
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Re: If x and y are prime numbers, then which one of the following cannot [#permalink]
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Re: If x and y are prime numbers, then which one of the following cannot [#permalink]
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Math Expert
94342 posts