Question

18. Let A and B is the input of a subtractor then the borrow will be
O a. A AND B
O b. A' AND B
O C. A ORB
O d. A AND B

Answer 1

Answer:

l think its A ............

Answer 2

If A and B are the inputs of a subtractor then the borrow will be $A'\cdot B$ (A' AND B)

Explanation:

• The subtractor is one in all the categories of the combinatory combinational circuit that generates an output that is the subtraction of 2 binary numbers.

• Through this answer on Subtractors, we will study the nature of half subtractors with the truth tables and mathematician expression.

The truth table of Half subtractor is as follows:

    A                 B                       DIFFERENCE            BORROW

    0                 0                                  0                          0

    0                  1                                   1                           1

    1                  0                                   1                           0

    1                   1                                   0                          0

• By observing the nature of the borrow column we can conclude that it is only high when the input A is low and the input B is high.

• So the Boolean expression for Borrow will be $A' \cdot B$.

Hence, If A and B are the inputs of a subtractor then the borrow will be $A'\cdot B$ (A' AND B).