Problem Solving
试题详情
题目：
Each signal that a certain ship can make is comprised of 3 different flags hanging vertically in a particular order. How many unique signals can be made by using 4 different flags?
选项:
A、10
B、12
C、20
D、24
E、36
答案:
D
提问：
Each signal that a certain ship can make is comprised of 3 different flags hanging vertically in a perticular order.How many unique signals can be made by using 4 different flags?
A 10
B12
c 20
D 24
E 36
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0
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