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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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?
http://img201.imageshack.us/img201/6139/marbles1as2.gif
Once again, expand the polynomial and find the coefficient of x^17.