GATE Computer Science (CS) 2016 Shift 2 Solved Paper

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Question : 18 of 65
 
Marks: +1, -0
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 is TRUE?
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