#probability problem help

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crystal mulch
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Some probability stuff here, anyone know how to solve this problem?
Any help will be appreciated. Thank you

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hollow crowBOT
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  1. Wait patiently for a helper to come along.
  2. Once someone helps you, say thank you and close the thread with: ```diff
    +close
echo parcel
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do u still need an answer?

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if so ill provide

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to be certain means that we should look at the worst case scenario

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so

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we have 4 kinds of books

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and we need to get 5 of one type

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so worst possible case is that we get 4 of each type, without getting a 5th out of any other type

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so that is 4 X 4 = 16 books

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then the 17th book will assure us we get 5 books of one type