How many solutions to x1+x2+x3=17 are there if x1,x2,x3 are non negative integers?

How many solutions if 0 <= x1,x2,x3 <= 7?

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- March 16th 2007, 07:03 AMsplashHow many ways for 3 #'s to add up to 17?
How many solutions to x1+x2+x3=17 are there if x1,x2,x3 are non negative integers?

How many solutions if 0 <= x1,x2,x3 <= 7? - March 16th 2007, 09:15 AMPlato
http://img201.imageshack.us/img201/6139/marbles1as2.gif

Once again, expand the polynomial and find the coefficient of x^17.