题是网上找的:
原文:Problem
A fancy bed and breakfast inn has 5 rooms , each with a distinctive color - coded decor . One day 5 friends
arrive to spend the night . There are no other guests that night . The friends can room in any combination
they wish , but with no more than 2 friends per room . In how many ways can the innkeeper assign the
guests to the rooms ?
( A )2100 ( B )2220 ( C )3000 ( D )3120 ( E )3125
SCEN
译文:问题
一家豪华的住宿加早餐旅馆有5间客房,每间客房都有独特的彩色装饰。一天5个朋友
来这里过夜。那天晚上没有其他客人了。朋友们可以选择任何组合
他们希望,但每个房间不超过2个朋友。旅馆老板可以用多少种方式分配
客人到房间吗?
(a)2100 (b)2220 (c)3000 (d)3120 (e)3125
SCEN