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The American Statistician Volume 38, 1984 - Issue 4
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The Teacher's Corner

Justifying an Invalid Derivation of the Probability of a Union of Events

Paul H. Jackson University College of Wales, Aberystwyth, Dyfed SY23 3DB, Wales, U.K.
Pages 291-293 | Received 01 Dec 1983, Published online: 30 Mar 2012
 
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Abstract

An appealing, but invalid, derivation of the probability that at least one of n events occurs is justified, using a particular definition of subtraction of events. The probabilities that exactly m and at least m of the n events occur are derived similarly.

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