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If X and Y are prime integers, what is X+Y? 1. XY is a [#permalink]
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29 Jul 2010, 13:35
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If X and Y are prime integers, what is X+Y? 1. XY is a prime integer 2. Y<X<6
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Re: Prime integers [#permalink]
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29 Jul 2010, 13:44
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Stmt 1. \(XY=Prime number\) :: \(53=2\) & \(75=2\) Both equations cover stmt 1, hence stmt 1 is insufficient. Stmt 2. \(Y<X<6\) :: \(2<5<6\) & \(2<3<6\) both inequalities cover stmt 2, hence stmt 2 is also insufficient. Combining both statments \(X & Y\) can be \(2 & 5\) or \(3 & 5\). Hence insufficient. Answer is "E". Hope it helps.
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Re: Prime integers [#permalink]
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01 Aug 2010, 09:29
yeah. this is easy! =)



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Re: Prime integers [#permalink]
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01 Aug 2010, 22:58
I used to hate prime number questions. But I feel much comfortable with them since I write down 2,3,5,7 immediately after I see such a questions.



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Re: Prime integers [#permalink]
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05 Aug 2010, 14:14
32=1, which is not prime, whereas 53=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!



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Re: Prime integers [#permalink]
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06 Aug 2010, 02:26
crazyum88 wrote: 32=1, which is not prime, whereas 53=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)



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Re: If X and Y are prime integers, what is X+Y? 1. XY 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) XY=prime 53=2 52=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
Answer E




Re: If X and Y are prime integers, what is X+Y? 1. XY is a
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27 Dec 2016, 23:53








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