Can anyone tell me if this is the right Venn Diagram for denoting C the event that exactly one of A and B occurs?

Its the one on the right at this website:

Venn Diagram -- from Wolfram MathWorld

Also how would you write an expression for C in terms of unions, intersections and complement of A and B.

And then use that to find an expression of P(C) in terms of P(A),P(B) and P(A n B)