SOLUTION: A summer reading list contains 15 titles. In how many ways can 5 titles be chosen from the list?

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Question 1092320: A summer reading list contains 15 titles. In how many ways can 5 titles be chosen from the list?
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
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If the order in your selection does matter, then the answer is 15*14*13*12*11 = 360360 ways.



If the order of books does not matter, then the answer is C%5B15%5D%5E5 = %2815%2A14%2A13%2A12%2A11%29%2F%281%2A2%2A3%2A4%2A5%29 = 3003 ways.


On permutations and combinations see the lessons
    - Introduction to Permutations
    - PROOF of the formula on the number of Permutations
    - Problems on Permutations
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Combinatorics: Combinations and permutations".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.