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Logic Gates

Q1: If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?

A All inputs must be LOW.

B All inputs must be HIGH.

C At least one input must be LOW.

D At least one input must be HIGH.

ANS:C - At least one input must be LOW.

Inputs = a, b, c. and output = y. So resultant will be y = abc.

truth table of and gate:

a b c y
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 1



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