7个数字有多少种排列
1.2.3.4.5.7.7个数字 列:7654321 7564321 7465321 .1234567..1236547 这样不重复的排列有多少
人气:145 ℃ 时间:2020-08-25 14:23:23
解答
1234567.1234576.1234657.1234675.1234756.1234765.1235467.1235476.1235647.1235674..1236457.1236475.1236547.1236574.1237456.1237465.1237546.1237564.1243567.1243576.1243657.1243657.1243675.1243756.1243765.1245367.1245376.1245637.1245673.1245736.1245763.1246357.1246375.1246537.1246573.1246735.1246753.1247356.1247365.1247536.1247563.1247636.1247653.1324567.1324576.1324657.1324675.1324756.1324765.1325467.1325476.1325647.1325674.1325746.1325764.1326457.1326475.1326547.1326574.1326754.1326745.1327456.1327465.1327546.1327564.1327645.1327654.134...倒137 ..每个24中 好有134..135..136..137...还有4个 共96个 倒现在为止有160种排列了 在把开头1 换2...3...4..5...6...7 等于160*7=1020种排列
推荐
- 0-9数字1组7个有多少种排列
- 数字0到7,能有多少组合
- 有依次排列的三个数:2,7,5
- 5个1到7的数字随机排列有几种排法
- 4个数字分别是4,3,7,4.请问一共有多少种排列方法,请一一列出;谢谢!
- x-1分之3x-1-x分之2=1数学分式方程
- 小芳、小丽和小静比赛做口算,结果小芳比小丽多做12题,小丽比小静多做9题.三人一共做了78题,三人各做了儿道题?
- 一捆电线,第一次用去全长的1/6,第二次用去2/3米,两次共用去2米,这捆电线原来有多少米?
猜你喜欢