If A, B and C are subsets of a Universal set, then which one of the following is not correct?

If A, B and C Are subsets of a given set, then which one of the following isrelations is not correct?

If A is a subset of B, then which one of the following is correct

If A is a subset of B, then which one of the following is correct?

If A is a subset of B, then which one of the following is correct ?

If (A-B)uu(B-A)=A for subsets A and B of the universal set U, then which one of the following is correct?

If A subset of B ,then which one of the following is correct?

If A and B are subsets of the universal set U, then show that A⊂ A∪ B.

Let A_(1) , A_(2) and A_(3) be subsets of a set X . Which one of the following is correct ?

If A and B are two sets satisfying A-B = B - A. then which one of the following is correct?