GMAT数学Joshua and Jose work at an auto repair center with fou
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GMAT数学
Joshua and Jose work at an auto repair center with four other workers.For a survey on a healthcare insurance,2 of the 6 workers will be randomly chosen to be interviewed.What is the probability that Joshua and Jose will be both chosen?
A和B在同一家修理中心工作,这家修理中心一共有6人,一个健康报告的采访将会随机采访两个人,请问AB被同时采访的几率是多少?
同上只有A或者B才采访到的几率是多少?
A和B都没被采访到的几率多少?
我太痛苦了,每次做完了以为会了,下次碰到另外一种变体又不会做.怎么才会学会做这类型的题目呢
方法啊 思路啊 我是要去考试啊
Joshua and Jose work at an auto repair center with four other workers.For a survey on a healthcare insurance,2 of the 6 workers will be randomly chosen to be interviewed.What is the probability that Joshua and Jose will be both chosen?
A和B在同一家修理中心工作,这家修理中心一共有6人,一个健康报告的采访将会随机采访两个人,请问AB被同时采访的几率是多少?
同上只有A或者B才采访到的几率是多少?
A和B都没被采访到的几率多少?
我太痛苦了,每次做完了以为会了,下次碰到另外一种变体又不会做.怎么才会学会做这类型的题目呢
方法啊 思路啊 我是要去考试啊
这不就是排列组合题么,从六个人里面选两个人采访的可能性有15种,选中的两人恰好是A,B的概率就是1/15
只有A或者B被采访到,责从A,B中选一个人有2种可能性,再从剩下的4人中选1人有4种可能性,总共就是8种,总可能性有15种,所以就是8/15
A,B都没被采访到,责就在剩下4人里选2人,有6种可能性,总可能性有15种,所以是6/15,即2/5
只有A或者B被采访到,责从A,B中选一个人有2种可能性,再从剩下的4人中选1人有4种可能性,总共就是8种,总可能性有15种,所以就是8/15
A,B都没被采访到,责就在剩下4人里选2人,有6种可能性,总可能性有15种,所以是6/15,即2/5
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