Permutations and Combinations
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An electronics store receives a shipment of 30 graphing calculators, including 3 that are
defective. Four calculators are selected to be sent to a local high school.
A. How many selections can be made using the original shipment?
B. How many of these selections will contain no defective calculators?
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Solution Summary
Permutations and Combinations are summarized in this solution.
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There are C^30_4 ways to select 4 calculators out of 30.
C^30_4 = 30!/(4!(30-4)!) = ...
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