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If r s = rs + r + s, then for what value of s is r s equal

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Manager
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If r s = rs + r + s, then for what value of s is r s equal [#permalink] New post 05 Apr 2009, 03:28
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15. If r☉s = rs + r + s, then for what value 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
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Posts: 919
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Kudos [?]: 158 [0], given: 17

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Re: R+S.... [#permalink] New post 05 Apr 2009, 09:39
Clearly (B)
will appreciate if you can Post the OAs after 2-3 responses
thanks
milind1979 wrote:
15. If r☉s = rs + r + s, then for what value 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

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Re: R+S....   [#permalink] 05 Apr 2009, 09:39
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If r s = rs + r + s, then for what value of s is r s equal

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