數學概率唔識做

👨🏻‍🏫 學術台數學

[匿名]

2010-04-21 6:41 am

1 The probabilities that Peter, Paul and Mary will win the championship in a singing
contest are 1/3,1/4 and 1/5 respectively.Find the probability that any one of them
will win the championship.

我唔明點解直接加埋就得
唔係贏輸輸 +
輸輸贏 +
輸贏輸
咁計既

我就係唔明咩時候直接加埋, 咩時候要乘埋另一方面輸既概率.

回答 (4)

螞蟻雄兵

2010-04-21 7:02 am

✔ 最佳答案

1 The probabilities that Peter, Paul and
Mary will win the championship in a singing

contest are 1/3,1/4 and 1/5 respectively.Find the probability that any one of
them

will win the championship.

Sol

冠軍只有１人

p=1/3+1/4+1/5

=(20+15+12)/60

=47/60

不考慮並列冠軍

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[匿名]

2010-04-25 6:23 pm

hunglelt 先點到我想問既野 @@thx

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hung

2010-04-21 8:02 am

因為題目問 any one of them
其中一人勝就滿足 (唔限制其餘兩人的勝/負情況)
如果改為 only one of then
咁就要fix 三人中只有一人勝出
即係你計果個

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