**SET DIFFERENCE**

The difference of two sets A and B,denoted AB or A-B, is the set containing those elements that are in A but not in B.

**SYMMETRIC DIFFERENCE**

The symmetric difference of A and B, denoted by A ∆ B is the set

(A - B) U (B - A)

**SET DIFFERENCE**

The difference of two sets A and B,denoted AB or A-B, is the set containing those elements that are in A but not in B.

**SYMMETRIC DIFFERENCE**

The symmetric difference of A and B, denoted by A ∆ B is the set

(A - B) U (B - A)