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3-2=1, which is not prime, whereas 5-3=2, which is prime. Therefore, the answer must be x=5 and y=2 (5+2=7). The answer should be C, both together are sufficient to answer the question!

3-2=1, which is not prime, whereas 5-3=2, which is prime. Therefore, the answer must be x=5 and y=2 (5+2=7). The answer should be C, both together are sufficient to answer the question!

from (1)+(2) we have x=5, y=3 x=5, y=2 "1" is not a prime, so x=3, y=2 doesn't fit. 2 possible options. Looks like (E)

Re: If X and Y are prime integers, what is X+Y? 1. X-Y is a [#permalink]

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27 Dec 2016, 23:53

I think that the quickest way to solve subject issue is using substitution approach (1) X-Y=prime 5-3=2 5-2=3 Not Suff (2) X<Y<6 agin not Suff As long as (1) & (2) have the same conditions then (1) +(2) is not Suff as well