一道有难度的JJ 请教

gmat02

1. An insurance company has a paper record and an electronic record for every claim. For an inaccurate paper record, 60% chances that the electronic record is inaccurate. For an inaccurate electronic record, 75% chances that the paper record is inaccurate. 3% of all the claims are inaccurate both in paper record and in electronic record. Pick one claim randomly, what are the chances that it is both accurate in paper record and in electronic record?
A.97% B.94% C.68% D.65% E.35%

Louisa_xy

bzbz 的“最近几道常考和出错的机经，请讨论”

回家过年

[em11][em11][em11]

Louisa_xy

没错,前面的帖子里刚刚讨论过

redli

选B，对吗？
设“inaccurate paper record”为X， inaccurate electronic record 为Y，
则：0.6Y=0.03   0.75X=0.03,算出X+Y=0.09,
答案:1-(0.09-0.03)=0.94