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# Strange Formula

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Manager
Joined: 29 May 2008
Posts: 113
Followers: 1

Kudos [?]: 102 [0], given: 0

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07 Sep 2009, 06:48
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0% (00:00) correct 0% (00:00) wrong based on 4 sessions

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if r@s = rs + r + s, the for what valued of s is r@s equal to r for all values of r?

A) -1
B) 0
C) 1
D) 1/(r+1)
E) r
Intern
Joined: 02 May 2009
Posts: 22
Followers: 0

Kudos [?]: 0 [0], given: 2

Re: Strange Formula [#permalink]

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07 Sep 2009, 07:13
would go for B, pls post OA
Manager
Joined: 29 May 2008
Posts: 113
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Kudos [?]: 102 [0], given: 0

Re: Strange Formula [#permalink]

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07 Sep 2009, 08:02
The correct answer is B

Would you please explain how you got to the right answer?

That would help a lot thanks
Senior Manager
Joined: 18 Aug 2009
Posts: 322
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Re: Strange Formula [#permalink]

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07 Sep 2009, 08:49
TheRob wrote:
The correct answer is B

Would you please explain how you got to the right answer?

That would help a lot thanks

rs + r + s = r
rs + s = 0
s(r+1) = 0
So s must be 0
Re: Strange Formula   [#permalink] 07 Sep 2009, 08:49
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# Strange Formula

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