In how many way n identical things can be distributed among r different persons where each person may get any number of things.
My book gives following ans:
(n+r-1)C(r-1)
but I am not able to reason it out.Please help.
In how many way n identical things can be distributed among r different persons where each person may get any number of things.
My book gives following ans:
(n+r-1)C(r-1)
but I am not able to reason it out.Please help.