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help with probability

Algebra
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In a class of 20, find the probability that you and your best friend ( you only have 1 in the class) will be chosen to represent your class at a student conference

Apr 14th, 2015

Probability = Number of favourable outcomes / Total Number of Outcomes

Favourable outcomes = 1 ( myself and my friend )

Total outcomes = 20C2

Probability = 1 / 20C2 = 1  / 190.........................................Answer


Apr 14th, 2015

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Apr 14th, 2015
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