First slide

Boolean operation

Question

The combination of NAND gates shown here under are equivalent to

Moderate

A

An OR and AND gates respectively
B

An AND and NOT gates respectively
C

An AND and OR gates respectively
D

An OR and NOT gates respectively

Solution

The following connection of NAND gate behaves like NOT gate.

$F o r F i r s t C i r c u i t C = \bar{\bar{A} . \bar{B}} = \bar{\bar{A}} + \bar{\bar{B}} = A + B (O R) F o r S e c o n d C i r c u i t C = \bar{\bar{A . B}} = A . B (A N D)$

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