NO.PZ2020010301000003
问题如下：
What are the sample spaces, events, and event spaces if you are interested in measuring the probability of a corporate takeover and whether it was hostile or friendly?
选项：
解释：
Using the notation No Takeover (NT), Hostile Takeover (HT) and Friendly Takeover (FT), the sample space is {NT, HT, HT}. The events are all distinct combinations of the sample space including the empty set, ø, NT, HT, FT, {NT, HT}, {NT, FT}, {HT, FT}, {NT, HT, FT}. The event space is the set of all events.
根本不可能发生的事件，为什么也算到event space里面呢？意义何在？比如{NT,HT}、{NT,FT}、{NT、HT、FT}
