Question

represent the Boolean expression P + Q R with the help of an nand Gate only​

Answer 1

Explanation:

Correct option is

D

OR gate

Given that

P+

P

ˉ

Q where P and Q are the inputs of the logic circuit,

Let Y=P+

P

ˉ

Q

=P(1)+

P

ˉ

Q

=P(1+Q)+

P

ˉ

Q ∵1+X=1

=P+PQ+

P

ˉ

Q

=P+Q(P+

P

ˉ

) ∵

X

ˉ

+X=1

=P+Q

Hence the following expression represents OR gate

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