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find the total no of ways to distribute n things among r people..... ans is n+r-1 C r-1 ut i dint understand how we get this result?... can you help?

find the total no of ways to distribute n things among r people.....


ans is n+r-1 C r-1


ut i dint understand how we get this result?... can you help?


 

Grade:12th Pass

1 Answers

Nirmal Singh.
askIITians Faculty 44 Points
10 years ago
Ways of distributing n things among r people
If n<r then answer will be rPn ways.
(Permutation formula for n from r)(Permutation is used here because same person can again be
selected.
Alternately if n >r, we use nPr ways ( r persons chosen from n)(here also with replacement so
permutation is used).
Regards,
Nirmal Singh
Askiitians Faculty

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