If A=[\table 1 , 5 ; 6 , 7] and B=[\table 1 , 0 ; 1 , 1], then which one of the following is incorrect.

Correct Answer is : (AB)′=A′B′

( {A}+ {B})^{'}= {B}^{'}+ {A}^{'}

( {AB})^{-1}= {B}^{-1} \cdot {A}^{-1}