This question was previously asked in

UPRVUNL AE EC 2014 Official Paper

Option 1 : (AB)’ = A’ + B’

CT 3: Building Materials

3014

10 Questions
20 Marks
12 Mins

De Morgan’s first theorem:

According to De Morgan’s first theorem, a NOR gate is equivalent to a bubbled AND gate.

The Boolean expressions for the bubbled AND gate can be expressed by the equation shown below.

\(\overline {A + B} = \bar A.\bar B\)

De Morgan’s second theorem:

According to De Morgan’s first theorem, a NAND gate is equivalent to a bubbled OR gate.

The Boolean expressions for the bubbled OR gate can be expressed by the equation shown below.

\(\overline {A.B} = \bar A + \bar B\)