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
presently we are in alpha stage , incase of typos please report at http://thousandps.blogspot.com/2009/11/bugs.html. we would be uploading all the 1000 Questions soon .
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