可能性：
Random Experiment
An experiment, all possible outcomes of which are known to us in advance but the outcome of any specific performance cannot predicted before completion of experiment, is called as random experiment. An instance of random experiment might be tossing of coin.
样本空间
A set of all the possible outcomes associated with the same random experiment is called as sample space and is denoted by 'S' usually. Consider experiment of tossing a die. If we want numbers that shows on top face, then the sample space would be
S1= {1, 2, 3, 4, 5, 6}
Event
An event is subset of the sample - space.
发生在任何样本空间我们可以感兴趣ence of certain events instead of in occurrence of a specific element in sample space.
Simple Event
如果事件是仅包含一个样品空间元素的集合，则称为简单事件。
Compound Event
A compound event is 1 which can be represented as a union of the sample points.
For example, the event of drawing heart from the deck of cards is subset A ={heart} of sample space S = {heart, spade, club, diamond}. Thus A is a simple event. None event B of drawing red card is a compound event as B = {heart U diamond} = {heart, diamond}.
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