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Question

In the Boolean algebra, of the following one which is not equal to A is

A
A.A
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B
A+A
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C
¯A.A
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D
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯A+¯A
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Solution

The correct option is B ¯A.A
The truth table for AND gate is given as shown in the figure.
When A is true, ¯A is false and vice versa.
Hence value of ¯A.A is always false(looking at the second and third row of the table) which is not equal to A.
Hence, option C is the answer.

602370_16466_ans.gif

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