List of top Computer Science Questions on Boolean Algebra

Which one of the following options is not a property of Boolean Algebra? (Note: $+$ is OR operation, $\cdot$ is AND operation, and $'$ is NOT operation.)

Consider the following Karnaugh Map (K-map). Minimal Function generated by this Karnaugh map is: 

What should be the output of the following boolean expression after simplifying it to a minimum number of variables? \[ a'b' + ab + a'b \]