標題: [Core] Probability [打印本頁]

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作者: lscdbs    時間: 2016-2-15 06:52 PM     標題: Probability

In a pet shop, there are 4 white cats, 5 brown cats, 3 grey cats and 3 black cats. 4 cats are selected at random. Find the probability that 4 selected cats are of different colours.

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作者: iloveaycgigi    時間: 2016-2-15 07:13 PM

(4C1x5C1x3C1x3C1)/15C4

correct?

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作者: lkh1024    時間: 2016-2-15 08:20 PM

如果4隻貓唔色，用1-p(同色) ,
1-P(４白+4啡-(３灰1白+3灰1啡)*2)

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作者: lscdbs    時間: 2016-2-15 10:16 PM     標題: 回覆 2# iloveaycgigi 的帖子

yes it is correct thank you so much!

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