Finit sets - showing something
I need to show that $n(A-B) = n(A)-n(A\cap B)$.
Having the truth table, I can find these sets, but don't know how to show,
I know that is it, but show is a little bit hard.
$$\begin{array}{|l|l|l|} \hline A&B\\\hline V & V & n(A\cap B) \\ V & F &
n(a) \\ F & V & \text{~} \\ F & F & \text{~} \\\hline \end{array}$$
How can I show that?
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