If the input to the digital circuit shown below, consisting

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If the input to the digital circuit shown below, consisting of a cascade of 20 EX-OR gates is X. Then the output Y is equal to— 1 X Y

1. 0
2. 1
3. X
4. X

Correct Option: B

A = 1X + X1 = X
B = X X̿ + X X = X + X = 1
So, output after 20 Ex-OR gate is 1.