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# Long description

Probability space diagrams use circles to show combinations of probabilities. You know similar diagrams as Venn Diagrams.

1. A single circle in a rectangle. The circle is labelled P(A) and the rectangle around it is labelled (P(A) ) ̅ - P(A) with a line over it.
2. Two overlapping circles within a rectangle. The left-hand circle is labelled P(A); the right-hand is labelled P(B) and the overlapping region is labelled P(A ∩ B), the probability of A and B (∩ is like an upturned U and is the intersection symbol).