jbednarik6878 jbednarik6878

06-02-2018
Mathematics

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How many ways can four items be selected from a group of seven items?

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L4RIDER L4RIDER

06-02-2018

7!/(7-4)! = 840 ways

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An example of natural selection is the red color of a male cardinal. The females of the species choose mates based on the vibrant colors of the males' feathers.