SOLUTION: There are 15 different books. How many groups of 6 books can be selected?

Question 1177745: There are 15 different books. How many groups of 6 books can be selected?

Answer by ikleyn(52835) (Show Source): You can put this solution on YOUR website!
.


It is the number of COMBINATIONS of 15 different items taken 6 at a time.



The formula and the answer are 


         =  =  =  = 5005.   ANSWER

Solved.

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On Combinations, see introductory lessons
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
    - OVERVIEW of lessons on Permutations and 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.

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There are 15 different books. How many groups of 6 books can be selected? (answered by edjones)