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Question

A NOR gate and a NAND gate are connected as shown in the figure. Two different sets of inputs are given to this setup. In the first case, the inputs to the gates are A=0,B=0,C=0. In the second case, the inputs are A=1,B=0,C=1. The output D in the first case and second case respectively are:
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A
0 and 0
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B
0 and 1
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C
1 and 0
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D
1 and 1
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Solution

The correct option is D 1 and 1
In first case A=0,B=0
Output of NOR gate, Y=¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯A+B=1
This output is the input for NAND gate ie, Y=1 and C=0
D=¯¯¯¯¯¯¯¯¯¯¯Y.C=1
In second case A=1,B=0
Output of NOR Gate, Y=¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯A+B=0
This output is the input for NAND gate ie Y=0 and C=1
D=¯¯¯¯¯¯¯¯¯¯¯Y.C=1

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