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Strange Formula

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Manager
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Joined: 29 May 2008
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Strange Formula [#permalink] New post 07 Sep 2009, 05:48
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 3 sessions
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
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Re: Strange Formula [#permalink] New post 07 Sep 2009, 06:13
would go for B, pls post OA
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Re: Strange Formula [#permalink] New post 07 Sep 2009, 07:02
The correct answer is B

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

That would help a lot thanks
Senior Manager
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Re: Strange Formula [#permalink] New post 07 Sep 2009, 07:49
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, 07:49
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