1-9个数字任选3个有多少种方式

如果用ABCDEFGHI能列出具体排列方式么
2025-03-06 22:06:00
推荐回答(5个)
回答1:

C9^3=9*8*7/3/2=84种
还是可以排完的,就是太累了,呵呵
你想排的话就慢慢来
1,2,3
1,2,4
。。。
1,2,9
1,3,4,
1,3,5
。。。
7,8,9
自己排哈~~

楼上的算错了,因为你只要求选择3个,按你的意思应该不能重复吧,111不对吧?那就是84种
2楼的排漏了,比如说没有ACD,ACE哈

楼上的算法是,选出3种再排序了,他把123,213,312这样都当做不同的了

回答2:

选出来三个但是顺序无所谓的话应该是(9*8*7)/(3*2*1)=84种
选出来的三个数字排列顺序不同也算一种的话是9*8*7=504种

回答3:

C(9,3)=84
想全部列出来,如果数目巨大就不是人干的活,
只能是编一个计算机程序,让打印机打印出来。
编程时,一般用数组,再嵌套循环等等
(计算机最在行的就是做重复的处理!)。

回答4:

28种 是无序排列
ABC ABD ABE ABF ABG ABH ABI
BCD BCE BCF BCG BCH BCI
CDE CDF CDG CDH CDI
DEF DEG DEH DEI
EFG EFH EFI
FEG FEI
GHI

回答5:

C 9-3=9*8*7=
504种,太多了,
没有办法具体排列出来。。。。

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