GATE1989-5-a

930 views

Find values of Boolean variables $A, B, C$ which satisfy the following equations:

• A+ B = 1
• AC = BC
• A + C = 1
• AB = 0

edited

From $A+B=1$ and $AB=0$ we get either of $A,B$ is $1$ and another is $0$

Now, $AC=BC$, here $C$ has to be $0$ (because $A,B$ has different values)

$C=0$

Now, $A+C=1$

So, $A=1$ and $AB=0$ so, $B=0$

So, we get:

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

These are the values.

edited
0
Can A=1 B=0 C=1 be also be an answer?
0
@vipin Does AB = AC condition satisfying? When you are taking A = 1 B = 0 and C = 1.
0
There is no such condition AB=AC
0
Sorry, it is AC = BC.

The value of Boolean variables A,B,C {1,0,0}

0
this is also a easy way
–1 vote

A=1 B=0 And  C=0

–1 vote
Looking at first and third arguments, we can satisfy both by putting A =1 and B and C to 0 , now it can be easily checked that other constraints are still true.
–1 vote

think without ink ..!

A = 1

B= 0

C= 0

Related questions

1 vote
1
406 views
Provide short answers to the following questions: A switching function is said to be neutral if the number of input combinations for which its value is 1 is equal to the number of input combinations for which its value is 0. Compute the number of neutral switching functions of $n$ variables (for a given n).
Consider an excess - 50 representation for floating point numbers with $4 BCD$ digit mantissa and $2 BCD$ digit exponent in normalised form. The minimum and maximum positive numbers that can be represented are __________ and _____________ respectively.