SOLUTION: A student must pick 5 books out of 20 to read in a specific order. How many ways could the student do this?
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Question 409744: A student must pick 5 books out of 20 to read in a specific order. How many ways could the student do this? Found 2 solutions by stanbon, sudhanshu_kmr:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A student must pick 5 books out of 20 to read in a specific order. How many ways could the student do this?
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# of ways to pick 5 books of 20 = 20C5
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# of ways to read the 5 is a specific order: 5!
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Ans: 20C5*5! = 1,860,480 ways
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Cheers,
Stan H.
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You can put this solution on YOUR website! no. of ways to pick first book = 20
no. of ways to pick second book = 19 ...........( except the first )
no. of ways to pick third book = 18 .......(except the first and second)
and so on........
now, total no. of ways to pick 5 books in a specific order = 20*19*18*17*16
= 1860480
another ways...
no. of ways to pick 5 books from 20 books in a specific order = 20P5
= 20!/15!
= 1860480
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