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07-06-2016
Mathematics

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Find the number of ways to purchase 5 different kinds of juices from a selection of 10 juices

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μnibble μnibble

08-06-2016

Formula for combinations:
(n!)/(r!(n-r)!)

For you, this is:
10!/(5!(10-5)!) = 10!/5!5! = (10•9•8•7•6•5•4•3•2)/(5•4•3•2)(5•4•3•2) = (10•9•8•7•6)/(5•4•3•2) = 30240/120=252 different ways.

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