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brilliants [131]
4 years ago
9

Clarissa will create her summer reading list by randomly choosing 4 books from the 10 books approved for summer reading. She wil

l list the books in the order in which they are chosen. How many different lists are possible?A. 6B. 40C. 210D. 5,040E. 151,200
Mathematics
1 answer:
EastWind [94]4 years ago
8 0

Answer: D. 5040

Step-by-step explanation:

Given : The total number of books = 10

The number of books required by Clarissa = 4

Now , when we select r things from n things and order in which they are chosen matters then we use permutations to calculate the number of  different lists are formed to choose them.

The number of permutations of n things taking r at a time is given by :-

^nP_r=\dfrac{n!}{(n-r)!}

For r= 4  and n= 10 , we have

^{10}P_{4}=\dfrac{10!}{(10-4)!}\\\\=\dfrac{10\times9\times8\times7\times6!}{6!}=10\times9\times8\times7=5040

Hence, the number of different lists are possible = 5040

Therefore , the correct answer = D. 5040

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