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Question

The combination of NAND gates shown in figure are equivalent to 



A
an OR gate and an AND gate respectively
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B
an AND gate and a NOT gate respectively
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C
an AND gate and an OR gate respectively
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D
an OR gate and a NOT gate respectively
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Solution

The correct option is A an OR gate and an AND gate respectively

Case-1 
C=¯¯¯¯¯¯¯¯¯¯¯A.¯¯¯B=A+B  (De Morgan's Theorem)
So, the circuit is equivalent to OR gate .
Case-2

 
C=¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯AB.¯¯¯¯¯¯AB   =AB+AB=AB
Hence the circuit is equivalent to AND gate.
 

Physics

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