First slide

Boolean operation

Question

The logic symbols shown here are logically equivalent to:

Moderate

A

‘a’ AND and ‘b’ OR gate
B

‘a’ NOR and ‘b’ NAND gate
C

‘a’ OR and ‘b’ AND gate
D

‘a’ NAND and ‘b’ NOR gate

Solution

The “bubble (O)” at input side represents negated values.
$\begin{array}{l} fig a: Y = \bar{A} + \bar{B} \\ = \bar{A \cdot B} (N A N D) \\ Fig b: Y = \bar{A} \cdot \bar{B} \\ = \bar{A + B} (N O R) \end{array}$

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