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## logical operators :

There are three basic logical operators used in Boolean algebra.

## (a) OR:

OR operation is represented by a “+” sign. It is used for logical addition or Boolean sum. For example, A and B and the resulting value of C in the equation.

A+ B= C It is read as ” A OR B is equal to C”.

It may be noted that as there are two variable A and E So only 4 (2 ) combinations of inputs are possible.

## (b) AND:

This operation is represented by dot “.”. It is used for logical multiplication. The AND operation is defined by listing all possible combinations of, for example, A and B and the resulting value of C in the equation A: B ‘= C or AB = C read as “A AND B is equal to C”

## (c) NOT:

This operation is represented by a prime (‘) or bar (-) on the variable. It is used for complement operation. For example, A (read as A bar) means the complement of A or NOT A.