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Questions  

Truth table for system of four NAND gates as shown in figure

 

 

a
b
c
d

detailed solution

Correct option is C

Output of the circuit isY=AAB (B)AB   =AAB+BAB =ABA+B =A+BA+B =AB+AB    so option 3 is correct

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In the  following  circuit,  the  output  for  all  possible inputs and is expressed by the truth table


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