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I need help


You find 20 books that you checked out from the library as you are cleaning your room. You need to take 4 books back to the library, and you want to set them aside in a pile on your desk.  


How many ways can 4 of the 20 books be arranged in a pile?

Respuesta :

oreoeater75

Answer:

the answer is 20P4 = 4845

Step-by-step explanation:

Answer:

There are 20 ways to pick the first book, 19 ways for the second

Step-by-step explanation:

If order of the 4 books does not matter then

₂₀C₄ = 20! / (20-4)!4! = 20!/(16!*4!) = 4845 ways

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