$(10$ points$)$ Consider subsets A and B of a universal set U such that $|$U$|=100,(|)/($b$)$ar $($A$)(\backslash$cup $)/($b$)$ar $($B$)|=92,|$A$|=18,(|)/($b$)$ar $($B$)|=70.$ Find $($Hint: $|$A$\backslash$cup B$|=|$A$|+|$B$|-|$A$\backslash$cap B$|).($a$)|$A$-$B$|=($b$)|$A$\backslash$cup B$|=($ SHOW STEPS FOR EACH$)$