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If R and S are integers and RS+R is odd, which of the

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Intern
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Joined: 06 Apr 2007
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If R and S are integers and RS+R is odd, which of the [#permalink] New post 01 Jun 2007, 23:57
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A
B
C
D
E

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Question Stats:

100% (01:15) correct 0% (00:00) wrong based on 5 sessions
If R and S are integers and RS+R is odd, which of the following must be even.
a.R
b.S
c.R+S
d.RS-R
e.R^2 + S

they say B is the answer. I say B could be 0!!!!

Am I just missing something????
VP
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 [#permalink] New post 02 Jun 2007, 11:55
Himalayan is right !

according to OG , zero is even

R*S+R =

e=even
o=odd

we have two options:

(1) e*o+e = e
(2) o*e+o = o

since the stem states that R*S+R =odd then we will choose (2) and S must be even.
CEO
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 [#permalink] New post 02 Jun 2007, 15:43
RS+R = R(S+1) --> which is ODD
Now this implies that R is odd AND S+1 is odd. which means S is even

Ans B.
  [#permalink] 02 Jun 2007, 15:43
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If R and S are integers and RS+R is odd, which of the

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