Can someone help me out with the following question?

A= {1,3,5,6} and B={3,5} and C={a,b,c}

Compute:

a. A-B = {1,6}

b. B X C ( X meaning Cartesian Product) {(3,a),(3,b),(3,c),(5,a),(5,b),(5,c)}

c. A $\displaystyle A\cap B$ (B-A)

d. A $\displaystyle A\Delta B$ {1,6}

can anyone help me with 3.