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Math Help - How many ways for 3 #'s to add up to 17?

  1. #1
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    How 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?
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  2. #2
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    Once again, expand the polynomial and find the coefficient of x^17.
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