STEVE说的不对吧：

送交者: meiyou 于 2010-04-21, 13:33:17:

Let A is be the event of engine failure, and P(A) is its probability, we have A1 is the event of first engine failure, and A2 is the second engine failure, the total probability P(A1|A2) = P(A1) + P(A2) = 2P(A). What is wrong with that?

所有跟贴:

depends on how you define "engine failure", one or both. (无内容) - tinaliang (0 bytes) 2010-04-21, 13:53:35 (433826)
P(A1|A2) = P(A1) + P(A2) - P(A1 and A2) (无内容) - HHS (0 bytes) 2010-04-21, 13:46:59 (433823)
- P(A1|A2) is bad notation on Steven's part. It meant P(A1 or A2) - HHS (83 bytes) 2010-04-21, 14:03:54 (433829)
  - yeah, yor're right. I should use or. - steven (118 bytes) 2010-04-21, 16:52:22 (433880)
- If you draw a Venn diagram, it is very clear (无内容) - HHS (0 bytes) 2010-04-21, 13:48:04 (433825)

加跟贴