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Logic Gates

Q1: If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

A 1

B 2

C 7

D 8

ANS:C - 7

Let there are three inputs a,b,c so truth table for the three input has 8 possibilties.
a b c o/p
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 1
1 1 0 1
1 1 1 1
this is the truth table for or gate
and output(o/p) of or gate is a+b+c.



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