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If \(xy + z = x(y + z),\) which of the following must be true?
A. \(x=0\) and \(y=0\)
B. \(x=1\) and \(y=1\)
C. \(y=1\) and \(z=0\)
D. \(x=1\) or \(y=0\)
E. \(x=1\) or \(z=0\)
Answer: E
Source: GMAT Prep
A. \(x=0\) and \(y=0\)
B. \(x=1\) and \(y=1\)
C. \(y=1\) and \(z=0\)
D. \(x=1\) or \(y=0\)
E. \(x=1\) or \(z=0\)
Answer: E
Source: GMAT Prep
