指出下列事件是必然事件、不可能事件,还是随机事件.(1)某体操运

指出下列事件是必然事件、不可能事件,还是随机事件.

(1)某体操运动员将在某次运动会上获得全能冠军;

(2)一个三角形的大边对的角小,小边对的角大;

(3)如果a>B,那么B<A;

(4)某人购买福利彩票中奖.

答案

(1)(4)是随机事件,(2)是不可能事件,(3)是必然事件.

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