问题
填空题
将某四名同学分别保送到清华、北大和复旦等三所大学深造,每所学校至少保送1人,则不同的保送方案共有______种.
答案
分两步进行,先把4名学生分为2-1-1的三组,有C42=6种分法,
再将3组对应3个学校,有A33=6种情况,
则共有6×6=36种保送方案;
故答案为36.
将某四名同学分别保送到清华、北大和复旦等三所大学深造,每所学校至少保送1人,则不同的保送方案共有______种.
分两步进行,先把4名学生分为2-1-1的三组,有C42=6种分法,
再将3组对应3个学校,有A33=6种情况,
则共有6×6=36种保送方案;
故答案为36.
连词组句。 |
1. very much, likes, Danny, my, friend, donuts →__________________________________________ 2. shorts, her, clothes, are, favourite →__________________________________________ 3. school, at, lunch, have, Tom and his classmates →__________________________________________ 4. go, do, to, how, school, you →__________________________________________ 5. does, when, your, brother, up, get →__________________________________________ |