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Conditional Probability

In elementary probability, the conditional probability of an event

given an event

is the ratio

, provided

. Visualize the events as plane regions (rectangles here) and their probabilities as the areas of those regions. Then the conditional probability

is the fraction of

's area covered by the overlap of the two regions (purple). Use the sliders to adjust the probabilities (areas) of

and

and the black locator dots to change the location of

and

, thereby changing the overlap.

(10 lines omitted)

Contributed by: Chris Boucher

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