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In the following gate network which gate is redundant?

  1. Gate no.$1$
  2. Gate no.$2$
  3. Gate no.$3$
  4. Gate no.$4$
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Gate on whose removal value of logic expression doesn't change is one which is redundant.

$F =  (w'z + w' + z'xy)'$

$w'z+w' = w'$

So $F = (w' + z'xy)'$

$w'z$ term is eliminated, which is part of expression due to logic gate $2$.

So B is correct
Answer:

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