[離散] 生成函數
Find the generating function for the number of integer solutions to
x1 + x2 + x3 + x4 = r , with 1 <= x1 <= x2 <= x3 <= x4
請問這題要怎麼解?
謝謝
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推
08/16 19:12, , 1F
08/16 19:12, 1F
→
08/16 19:13, , 2F
08/16 19:13, 2F
→
08/17 01:25, , 3F
08/17 01:25, 3F
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