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) (E) r
(A) –1 (B) 0 (C) 1
(D) (E) r
The question asks -> For what value of s, rs + r + s will be = rIf r☉s = rs + r + s, then for what value of s is r ☉s equal to r for all values of r?
we can clearly see, When s=0 => rs + r + s =r
Otherwise, plug in the answer choices in the above equation and see for which choice we satisfy the equation rs + r + s=r
Is the OA B) 0 ?
Amit
