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Question

What is the output Y in the following circuit when all the three inputs A, B, C are first 0 and then 1?

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A
1,1
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B
0,1
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C
0,0
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D
1,0
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Solution

The correct option is C 1,0
Here the gate P is a logic symbol of AND gate and Q is a NAND gate.
So, the output of P is Yp=A.B and the output of Q is
Y=¯Yp.C
When A=0,B=0,C=0Yp=0,Y=¯0.0=1
When A=1,B=1,C=1Yp=1,Y=¯1.1=0

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