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求数学智者(会英语的那种!)

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/16 10:35:12
求数学智者(会英语的那种!)
An Ice-cream parlor sells sundaes with 3 different types of ice-cream and 4 different toppings.They have 8 flavors of ice-cream and 10 toppings for their customers to choose from.
What is the probability that a customer orders a sundae including mint chip,cookies n' cream,and coffee ice-cream?
Give your answer as a fraction reduced to lowest terms or as a percentage rounded to the nearest whole percent.
__ __ __ x __ __ __ __
3种冰激凌 4种酱料
每一球冰激凌都有8种选择(题目没说他们不能三球都选一样的):
Ice-cream =8*8*8
每一种酱料都有10种选择:
Toppings= 10*10*10*10
总共有这么多种可能,放在分母:
Therefore,total possibilities (denomenator) = 8^3*10^4 = 5120000
但是由于酱料没有限制,所以其实到时候每一种可能性里,每一种又有10*10*10*10的酱料可能,所以分子上面又会出现这10^4,彼此就cancel掉了.
所以其实,分母,也就是总可能性,只要8^3=512就可以了
题目问说那三种口味的冰激凌占了多少可能性.
顺序没差别,所以先选A再选B再选C跟先选C再选B再选A等都是一样的:
A B C
A C B
B A C
B C A
C A B
C B A
= 6种可能
所以答案是6/512.题目要求简化分数或者变成最接近的整数百分比:
因此,答案:
6/512 = 3/256
或者
6/512 * 100 = 1.171875 = 1%