Let, x1&oplus;x2&oplus;x3&oplus;x4 = 0 where x1, x2, x3, x4 are Boolean variables, and &oplus; is the XOR operator. Which one of the following must always be TRUE?

Let, x1⊕x2⊕x3⊕x4 = 0 where x1, x2, x3, x4 are Boolean variables,

1.	Let, x1⊕x2⊕x3⊕x4 = 0 where x1, x2, x3, x4 are Boolean variables, and ⊕ is the XOR operator. Which one of the following must always be TRUE?
A.	x1x2x3x4 = 0
B.	x1x3+x2 = 0
C.	x′1⊕x′3=x′2⊕x′4
D.	x1+x2+x3+x4 = 0
Answer» D. x1+x2+x3+x4 = 0

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Let, x1⊕x2⊕x3⊕x4 = 0 where x1, x2, x3, x4 are Boolean variables, and ⊕ is the XOR operator. Which one of the following must always be TRUE?

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