Test Index

WAEC Computer Studies 2021 Paper

Question : 14

Total: 50

Solution:

Concept:

Trace the logic circuit from left to right and write the Boolean expression for each gate output.

Explanation:

The first gate is a NAND gate with inputs

A

and

B

So its output is

\overline{A \cdot B}

The input

C

passes through a NOT gate.

So the output of the NOT gate is

\overline{C}

These two outputs are connected to an OR gate.

Therefore, the OR gate combines them as a logical sum.

The final expression becomes:

Z = \overline{A \cdot B} + \overline{C}

Answer:

Z=\overline{A.B} + \overline{C}

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