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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

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The correct Answer is:
A
`bar((bar(A.bar(A.B))) . (bar(bar(A.B)B))) = (bar(bar(A.bar(A.B)))) + (bar(bar(bar(A.B).B)))`
`Y = A. (barA . barB) + (barA + barB) . B`
`= A. barA + A .barB + barA. B + B.barB Y = (A. barB) + (barA . B)`
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