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08-01-2020
Mathematics

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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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fahadisahadam fahadisahadam

13-01-2020

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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