The Venn Diagram below models probabilities of three events, A, B, and C. A blue & green B C green & yellow Red only The probabilities for each event are given by the ratio of the area of the event to the total area of 72. For example, E C is Red Only. Area of Red So, for the probability of Event C, you have: P(C)=- Total Area 18 12x6 72 4 18 1 = 0.25