If an outcome can be from sets A=m or B=n with no overlaps, where A \cap B = \emptyset, then, the total number of outcomes are |A| + |B| = m+n If there are overlap:
\begin{equation} N = |A|+|B| - |A \cap B| \end{equation}
If an outcome can be from sets A=m or B=n with no overlaps, where A \cap B = \emptyset, then, the total number of outcomes are |A| + |B| = m+n If there are overlap: