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Q.

The output of OR gate is 1

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a

if either input is zero

b

if both inputs are zero

c

if either or both inputs are 1

d

only if both inputs are 1

answer is B.

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Detailed Solution

OR gate has two inputs A and B and a output Y. It follows a logic operation represented by   '+'. Thus, its Boolean expression is

A + B = Y

The truth table of OR gate is 

Question Image

Thus, after observing its Boolean  expression  and its truth table, it is obvious that output of OR gate is 1 if either or both inputs are 1.

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