$[2$ marks$]$

$7\mathrm{.}2$ Convert the following expression into expanded form and use the Karnaugh map method to obtain the minimal sum$-$of$-$products expression.

$[5$ marks$]$

$Y=A\frac{*}{b}ar(B)+A*B*C\frac{+}{b}ar(A)\frac{*}{b}ar(B)$