# Digital Electronics - Combinational Logic Analysis - Discussion

### Discussion :: Combinational Logic Analysis - General Questions (Q.No.4)

4.

The 8-input XOR circuit shown has an output of Y = 1. Which input combination below (ordered A – H) is correct? [A]. 10111100 [B]. 10111000 [C]. 11100111 [D]. 00011101

Answer: Option A

Explanation:

No answer description available for this question.

 Sandeep Mandal said: (Mar 17, 2011) We know that in XOR gate same input is 0 and different input is 1. For eg, suppose A=1 and B=1 i.e same input. So the result will be 0. So the correct answer is "A".

 Sundar said: (Mar 7, 2012) Option A = 10 11 11 00 A XOR B = 1 XOR 0 => 1 C XOR D = 1 XOR 1 => 0 E XOR F = 1 XOR 1 => 0 G XOR H = 0 XOR 0 => 0 (A XOR B) XOR (C XOR D) = 1 XOR 0 => 1 .....(1) (E XOR F) XOR (G XOR H) = 0 XOR 0 => 0 .....(2) (1) XOR (2) = 1 XOR 0 => 1. Hence the Option A is correct.

 Eng. Jojo said: (Nov 29, 2013) XOR is odd function, so if : # of 1 is odd , y = 1. # of 1 is even , y = 0. So when look to the options, In option a : # of 1 = 5 (odd) so y =1

 R C Pandey said: (May 8, 2015) What's an odd function?

 Sunil said: (Sep 1, 2015) Looking the options where the number one is in odd that is the answer.

 Ramya said: (Mar 23, 2018) Agree @Sunil.

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