My notes over Mark Maxwell’s course, Probability I, and his textbook, Probability & Statistics with Applications, Second Edition. Combinatorial Probability# --- The fundamental theorem of counting is also known as the multiplication principle. Given that there are $N(A)$ outcomes, and for each of these outcomes, there are $N(B)$ outcomes, then the total number of outcomes for the two combined is equal to $N(A)\cdot N(B)$. Example 1
