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Gmat question : Numbers

Expert replies
by msd_2008 » Mon Dec 01, 2008 7:54 pm
1. For any numbers a and b, a ◦ b = a + b – ab.
If a ◦ b = 0. which of the following CANNOT be a value of b?
(A) 2
(B) 1
(C) 0
(D) -1
(E) -3/2

The OA is B. Dont know how.

Regards
MSD
When the going gets tough, the tough gets going.
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Source: — Problem Solving |