Amy and Bill are two of the 10 people joinging a mass games. If two people are to be selected at random as group leaders. find the probaility that both Amy and Bill are selected.
我想知道計的步驟!!
PROBABILITY
2011-05-31 2:51 pm
回答 (1)
2011-05-31 4:16 pm
收錄日期: 2021-04-23 20:47:26
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https://hk.answers.yahoo.com/question/index?qid=20110531000051KK00164