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Q#1
Combinational Circuits
GATE EE 2007
MCQ
+2 marks
-0.66 marks
A, B, C and D are input bits, and Y is the output bit in the XOR gate circuit of the figure below. Which of the following statements about the sum S of A. B, C, D and Y is correct?
S is always either zero or odd
S is always either zero or even
S = 1 only if the sum of A, B, C and D is even
S= 1 only if the sum of A, B, C and D is odd
Explanation:
Expression of sum of 4 bits A, B, C and D is 
Expression of Y=
Expression of S= 
So, S is always zero or even
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