If xy+z = x(y+z), which of the following must be true?

1. x=0 and z=0
2. x=1 and y=1
3. y=1 and z=0
4. x=1 or y=0
5. x=1 or z=0






solve the eq and you get...

X = XZ
X-XZ=0
X = 1 or Z = 0
Ans : E