Prep里面的两道题目

fdx3000

At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the position of the people are different relative to each other. What is the total number of different possible seating arrangements for the group? 答案24  为什么啊？求详细说明

The Achaemenid empire of Persia reached the Indus valley in the fifth century B.C, bringing the Aramaic script with it, from which was derived both northern and southern Idian alphabets.
A.    the Aramaic script with it, from which was derived both northern and
B.    the Aramaic script with it, and from which deriving both the northern and the
C.    with it the Aramaic script, from which derive both the northern and
D.    with it the Aramaic script, from which derives both northern and
E.    with it the Aramaic script, and deriving from it both the northern and
答案选C   求原因    C 中derive为什么加S 啊~~~奇怪 主语不是单数么？？？？？
求NN解答~！

myungryong

from which 后是倒装结构 alphabets是主语 因此用 derive

fdx3000

[quote]
from which 后是倒装结构 alphabets是主语 因此用 derive


恩啊~~~原来~

agnesliu

A55=5*4*3*2=120，然后排除两两相对位置不变的可能性，也就是同时左移或右移的情况
120/5=24
另一个帖子看来的，应该对的吧