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Ishaan94
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Number of ways of distributing \(n\) identical things among \(r\) persons when each person can get any number of things.
@Zarkon
 2 years ago
 2 years ago
Ishaan94 Group Title
Number of ways of distributing \(n\) identical things among \(r\) persons when each person can get any number of things. @Zarkon
 2 years ago
 2 years ago

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Ishaan94 Group TitleBest ResponseYou've already chosen the best response.0
Usually it should be \(\binom{n}r\) but since each person can get any number of things including zero. I made it \(\binom{n+r}{r}\) but in the book it's given \(\binom{n+r1}{r}\)
 2 years ago

Zarkon Group TitleBest ResponseYou've already chosen the best response.1
stars and bars ;)
 2 years ago

KingGeorge Group TitleBest ResponseYou've already chosen the best response.2
I believe this could be solved with the equation \[x_1+x_2+...+x_r=n.\]Where every \(x_i\) gets an integer greater than or equal to 0. Solving this problem is well known as the "Stars and Bars" problem and is given by \[\left(\!\!\binom{n}{r}\!\!\right)=\binom{n+r1}{r}\] You have that \(1\) because that's how many symbols you have if you write out every integer as a star, and every plus sign as a bar.
 2 years ago

Zarkon Group TitleBest ResponseYou've already chosen the best response.1
http://en.wikipedia.org/wiki/Stars_and_bars_%28combinatorics%29
 2 years ago

Ishaan94 Group TitleBest ResponseYou've already chosen the best response.0
Thank you. Please medal eachother.
 2 years ago
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