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xy+z=x(y+z)gmatpup wrote:If xy+z = x(y+z), which MUST BE true?
A. x=0 and z=0
B. x=1 and y=1
C. y=1 and z=0
D. x=1 or y=0
E. x=1 or z=0
Please provide an explanation, I am confused
Answer is E
--> (xy + z) = x(y + z)gmatpup wrote:If xy+z = x(y+z), which MUST BE true?
There is nothing wrong with your logic. It's just that option B is a subset of E.LalaB wrote:@Anurag@Gurome and GmatMathPro
I have got the same answer choice. But ...looking closely to answer choices, I have suddenly thought -why B must be wrong?
we have xy+z = x(y+z). if x=1 and y=1, then 1*1+z=1(1+z)
whats wrong in my logic?
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