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题目 :现有 6本不同的书 ,求在下列条件下各有多少种分法 :( 1)将它们平均分成 3份 ;( 2 )将它们分成 3份 ,其中 1份 1本 ,1份2本 ,1份 3本 ;( 3 )将它们平均分给 3个人 ;( 4 )将它们分给 3个人 ,1人得 1本 ,1人得 2本 ,1人得 3本 .学生对上面问题觉得难以下手 ,特别是( 1)与 (
Title: There are 6 different books available, and find out how many sub-categories are: (1) divide them into 3 equal parts; (2) divide them into 3 parts, among which 1 copy 1 copy, 1 copy 2 Ben, 1 copy 3 copies; (3) distribute them equally to 3 individuals; (4) distribute them to 3 people, 1 person gets 1 book, 1 person gets 2 books, 1 person gets 3 books. Student has questions on the above I find it difficult to start, especially (1) and (