Problem Solving
试题详情
题目：
Jill, who lives in City C, plans to visit 3 different cities, M, L, and S. She plans to visit each city exactly once and return to City C after the 3 visits. She can visit the cities in any order. In how many different orders can she visit the 3 cities?
选项:
A、3
B、6
C、8
D、9
E、12
答案:
B
