■シチャーマンのサイコロ(その8)

 3個のサイコロを投げるとき,その目の和が3〜18になる場合の数は

(1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

{3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18}

 さらに4個目のサイコロを投げるとその目の和が4〜24になる場合の数は

(1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

  (1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

    (1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

      (1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

        (1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

          (1,3,6,10,15,21,25,27,27,25,21,15,10,6,3,1)

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

(1,4,10,20,35,56,80,104,125,140,146,140,125,104,80,56,35,20,10,4,1)

{4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24}

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