Permutation and Combination

Can anyone derive the following:

'n' identical things are distributed among 'r' persons. The formula for this is C(n-r+1,r-1). How do you derive this ?

Thanks

You start small, derive a conjecture, attempt to prove your conjecture, expand your small start, improve your theory, and on and on and on...

It's called INVESTIGATION!

Quote:

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Originally Posted by TKHunny

You start small, derive a conjecture, attempt to prove your conjecture, expand your small start, improve your theory, and on and on and on...

It's called INVESTIGATION!

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Alternatively, the OP could make Google his/her friend. (It's called research!).