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Truth table for system of four NAND gate...

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

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A

`=A*(bar(A)+barB)+B*(bar(A)+barB)`
`=A*bar(A)+A*bar(B)+B*bar(A)+B*barB`
`Phi=0+A.barB+B.barA+B.barB`
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