if A and B are any two sets, then prove that `A sub A uu B`

If A and B are any two sets, prove that : (A-B) uu B =A uu B .

If A, B and C are any three sets, then prove that : A nn (B-C) = (A nn B)-(A nn C) .

If A, B and C are any three sets, then prove that : A nn (B Delta C) = (A nn B) Delta (A nn C) .

If A and B are any two sets, prove that : A-B =A nn B^(c) .

If A and B are any two sets, prove that P(A) = P(B) implies A = B.

If A and B are two sets, then A nn (A uu B) equals

If A and B are two sets such that A sub B , then what is A uu B ?

If A and B are two sets such that : n(A)=20, n (A uu B)=42 and n (A nn B)=4 . Find: n (B), n (A - B) and n (B - A).

If A and B are two sets such that : n(A)=17, n (A uu B)=38 and n (A nn B)=2 . Find: n (B), n (A - B) and n (B - A).