Answer to Question #39113 in Combinatorics | Number Theory for leslie

Question #39113

How many solutions are there to the equation
x1+x2+x3+x4+x5=21,
where xi, i=1, 2, 3, 4, 5, is a non negative integer such that
b) xi≥1 for i=1, 2, 3, 4, 5?
c) 0≤x1≤11?

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