Question

For the combination of gates shown here, which of the following truth table part is not true?

• A. $A=0,B=1,C=1$
• B. $A=0,B=0,C=0$
• C. $A=1,B=1,C=1$
• D. $A=1,B=0,C=1$

Answer 1

Answer: (A)

$A=0,B=1,C=1$

Key Point Draw the truth table of the given operation and match the output with given options.
The combination of gates is given
For the given operation, equivalent truth table can be written as

$A$	$B$	$A\cdot B$	$A+A\cdot B$
$0$	$1$	$0$	$0$
$1$	$0$	$0$	$1$
$0$	$0$	$0$	$0$
$1$	$1$	$1$	$1$

Out of the given option, option (a) can't justify the given truth table. So, option (a) is correct.