2 votes 2 votes Suppose there is an equation $x_{1}+x_{2}+...........x_{r}=n$ Then number of unique solution in this given equation? Combinatory counting + – srestha asked Mar 13, 2018 srestha 397 views answer comment Share Follow See all 4 Comments See all 4 4 Comments reply akash.dinkar12 commented Mar 13, 2018 reply Follow Share (n+r-1)! / (n!.(r-1)!) ??? 0 votes 0 votes ankitgupta.1729 commented Mar 13, 2018 reply Follow Share @akash ,no. of non-negative solutions and no. of unique solutions both are the same things ? 0 votes 0 votes srestha commented Mar 13, 2018 reply Follow Share @ankit no they are not same that is why I asked the question 1 votes 1 votes ankitgupta.1729 commented Mar 13, 2018 reply Follow Share ok thanks ! 0 votes 0 votes Please log in or register to add a comment.