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

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Intern
Joined: 06 Apr 2007
Posts: 9
Followers: 0

Kudos [?]: 0 [0], given: 0

If R and S are integers and RS+R is odd, which of the [#permalink]  01 Jun 2007, 23:57
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Question Stats:

100% (01:12) 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
Joined: 08 Jun 2005
Posts: 1157
Followers: 6

Kudos [?]: 114 [0], given: 0

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
Joined: 17 May 2007
Posts: 2995
Followers: 55

Kudos [?]: 435 [0], given: 210

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.
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