discrete math problem
i have a hw problem that i have problem solving.
w + x+ y + z = 12
how many nonnegative interger solutions are there?
well, using the "r-combinations w/ repitition allowed" rule u get
3 seperators so the answer would be C(12+3,12) -> C(15,12)
ok, here''s what i have the problem in:
w needs to be 0 <= w <= 4, meaning it can only be 0,1,2,3,or 4
0<=x<=5
0<=y<=8
0<=z<=9
having a hard time with this... please help
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