A B C D E 5人站一排,A B均不与C相邻的站法有几种
问题描述:
A B C D E 5人站一排,A B均不与C相邻的站法有几种
答
所有情形-AC相邻-BC相邻+ABC相邻(即C在AB中间)
A(5,5)-A(4,4)*A(2,2)-A(4,4)*A(2,2)+A(3,3)*A(2,2)
=120-48-48+12
=36种