How many integer solutions are there to x1 + x2 + x3 + x4 + x5 = 31 with (a) Xi >= 0 (b) Xi > 0 (c) Xi >= i (where i = 1, 2, 3, 4, 5)
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How many integer solutions are there to x1 + x2 + x3 + x4 + x5 = 31 with
(a) Xi >= 0
(b) Xi > 0
(c) Xi >= i (where i = 1, 2, 3, 4, 5)
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