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20 February, 00:31

9. Based on the patterns observed in Exercises 5-8, describe a general formula that can be used to find the number of permutations of n things taken? at a time, or nPr

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  1. 20 February, 00:49
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    Answer: a. (n-1) (n-2) ... (n-r+1)

    Step-by-step explanation:

    a permutation of things taken at a time can be found using the formula.
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