# A Symmtric Difference Question

#### akolman

I have to admit that I am completely lost on this one.

For any three sets $$\displaystyle A, B, C,$$ show that $$\displaystyle A \bigtriangleup B = C$$ if and only if $$\displaystyle A=B \bigtriangleup C$$.

#### tonio

I have to admit that I am completely lost on this one.

For any three sets $$\displaystyle A, B, C,$$ show that $$\displaystyle A \bigtriangleup B = C$$ if and only if $$\displaystyle A=B \bigtriangleup C$$.