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
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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
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
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
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
（1）1/15
（2）8/15
（3）6/15
二楼答得很完整了，就是最后一问，可以直接用1减去前两问的答案