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# DS

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Manager
Joined: 05 Sep 2007
Posts: 144
Location: New York

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10 Aug 2008, 13:19
If r and s both positive numbers, is the product of r and s even?
1. r+3 is a prime number
2. s+1 is a prime number
Senior Manager
Joined: 23 May 2006
Posts: 309

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10 Aug 2008, 13:36
IMO A

RS = EVEN
E* E = E
O*E = E
E*O = E

s1. R IS ALWAYS EVEN 2 =3 = 5, 4+ 3 = 7 ETC.
SO IF R IS EVEN THEN EVEN IF S IS EVEN OR ODD YOUR PRODUCT "RS" WILL BE EVEN

S2. 1 + 1 + 2 AND S IS ODD
2+1 = 3 AND S IS EVEN
INSUFF

IMO A
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Joined: 28 Dec 2005
Posts: 1498

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10 Aug 2008, 13:52
yes, A. with stat 2, we could have odd*odd which gives an odd result, or odd*even
Re: DS   [#permalink] 10 Aug 2008, 13:52
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