(重複粗合)H,=Cr-l 〔例2)求H及H到 〔解) =cc-7-s, ColC20 《練智2》求H;及H(重複組合) + −1 = n r r n Hr C ﹝例 2﹞求 4 3 3 H4 及 H ﹝解﹞ 15 2 1 6 6 5 4 3 4 1 4 3 4 = ⋅ ⋅ = = = + − H C C , 20 3 2 1 6 6 5 4 3 4 3 1 3 4 3 = ⋅ ⋅ ⋅ ⋅ = = = + − H C C 《練習 2》 求 5 2 2 H5 及 H