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How many solutions are there to the equation x1 +x2 +x3 +x4 =25 where xi, i = 1, 2, 3, 4, is a non-negative integer
How many solutions are there to the equation x1 +x2 +x3 +x4 =25
where xi, i = 1, 2, 3, 4, is a non-negative integer such that
(a) xi 3 for i = 1, 2, 3, 4?
(b) x1 2,x2 3,x3 >5,x4 >7?
(c) 2 (d) 3
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