railway RRB JE (CBT I + CBT II) Mock Test 2024 Digital Electronics Logic Gates and Boolean Algebra Laws of Boolean Algebra
Which of the following Boolean expression is not correct?
1
\(\overline{\bar{P}+\bar{Q}}=P+Q\)
2
\(\overline{\bar{P}+\bar{Q}}=P\centerdot Q\)
3
\(\overline{\overline{P\centerdot Q}}=P\centerdot Q\)
4
All of these