engineering recuitment TANGEDCO Field Assistant (Trainee) Mock Test Digital Electronics Logic Gates and Boolean Algebra Laws of Boolean Algebra
Which of the following Boolean expressions is not correct?
1
\(\overline {X + Y} = \bar X\bar Y\)
2
\(\overline {\overline{\overline X} + Y} = \bar X\bar Y\)
3
\(\overline {\overline{\overline X} + \overline{\overline Y} } = \bar X\bar Y\)
4
\(\overline {\bar X + \bar Y} = \bar X\bar Y\)