A good way of illustrating probabilities is to use so-called Venn-diagrams. In effect this means representing the probability of an event with circles.
Mutually excluding events can be represented by two separate non-overlapping ciecles.
P(A) + P(B) = P(A U B)
Simultanously events can be illustrated by partially overlapping circles. The overlap then represents the instance of both events happening simultanously.
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