P(A1|A2) = P(A1) + P(A2) - P(A1 and A2)

P(A1|A2) = P(A1) + P(A2) - P(A1 and A2)

所有跟贴·加跟贴·新语丝读书论坛

送交者: HHS 于 2010-04-21, 13:46:59:

回答: STEVE说的不对吧：由 meiyou 于 2010-04-21, 13:33:17:

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)