The probability that a boy in Class 2 is in the football team is 0.4 and the
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The probability that a boy in Class 2 is in the football team is 0.4 and the probability that he is in the chess team is 0.5. If the probability that a boy in the class is in both teams is 0.2, find the probability that a boy chosen at random is in the football or the chess team.
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Related Book For 
A Concise Course In Advanced Level Statistics With Worked Examples
ISBN: 9780748754755
4th Edition
Authors: J. Crawshaw, J. Chambers
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