Question

The truth table given below is for (A and B are the inputs, Y is the output)
A B Y
0 0 1
0 1 1
1 0 1
1 1 0

• A. NOR
• B. AND
• C. XOR
• D. NAND

Answer 1

The correct option is D NAND

$A$	$B$	$Y$	$\overline{Y}$
0	0	1	0
0	1	1	0
1	0	1	0
1	1	0	1

We can observe from the table that $\overline{Y}=A.B\Rightarrow Y=\overline{AB}$

So, the table represents a NAND gate.