. It is the same as to ask: In how many ways you can select 5 boxes among 10 identical boxes.
The answer is
is the number of combinations of 10 items taken 5 at a time.
On combinations, see the 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".
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