tentukan (A n B)© (A u C)© (A n C)© A© n (B u C) (A n B)© n (A n C)

(A n B)©={5,20,25}
(A u C)©={25}
(A n C)©={3,7,18,20}

A© ={3,18,25}
B U C={2,3,5,7,18,25}
A© n (B u C) ={3,18,25}

(A n B)©={5,20,25}
A n C={2,5}
A n B)© n (A n C)={5}