+1 vote
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Suppose there is an equation

$x_{1}+x_{2}+...........x_{r}=n$

Then number of unique solution in this given equation?

0
(n+r-1)! / (n!.(r-1)!) ???
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@akash ,no. of non-negative solutions and no. of unique  solutions both are the same things ?
+1
@ankit
no they are not same
that is why I asked the question
0
ok thanks !