概率
某一事务在不异的前提下可能发生也可能不发生,这类事务成为随机事务。概率就是用来暗示随机事务发生的可能性巨细的一个量。很自然的把必然发生的概率定为1,并把不成能发生的事务的概率定为0,而一般随机事务的概率是介于0和1之间的一个数。
等概根基事务组
满住下列二条性质的n个随机事务A1,A2,─ An 被称为等概根基事务组:⑴ A1,A2,─ An
发生的机缘相等;⑵在任一尝试中,A1,A2,─ An 中只有一个发生。等概根基事务组中的任一随机事务Ai称为根基事务。如不美观事务B是由等概念根基事务组A1,A2,─ An 的m个根基事务组成,则事务B的概率P=m/n,这种谈判事务概率的模子称为古典概型。
ps:枚举组合连系概率中的古典概率就可以解决几乎所有的GRE数学概率问题,但要矫捷应用,而且良多问题问题看起来像概率题现实上它就是各抽屉事理。
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