Let

A $=\{$a$,$ b$\},$

B $=\{1,2\},$

and

C $=\{2,3\}.$

Use set$-$roster notation to write each of the following sets.

$($a$)$

A $($B $\backslash$cup C$)=$

Incorrect: Your answer is incorrect.

$($b$)$

$($A $$ B$)\backslash$cup $($A $$ C$)=$

Correct: Your answer is correct.

$($c$)$

A $($B $\backslash$cap C$)=$

Correct: Your answer is correct.

$($d$)$

$($A $$ B$)\backslash$cap $($A $$ C$)=$