第一個確定是D
然后后面的定有一個是A
就剩C
那么就是(D)+(A)+(B/C/E/F/G)
或者 (D)+(C)+(B/A/E/F/G)...
那就很清楚是1/10的概率...
= =!...
唉
SAT數(shù)學題,有關(guān)概率
SAT數(shù)學題,有關(guān)概率
A, B, C, D ,E , F, G
a list consists of all possible three-letter arrangements formed by using the letters above such that the first letter is D and one of the remaining letters is A. if no letter is used more than once in an arrangement in the list and one three-letter arrangement is randomly selected from the list, what is the probability that the arrangement selected will be DCA?
A, B, C, D ,E , F, G
a list consists of all possible three-letter arrangements formed by using the letters above such that the first letter is D and one of the remaining letters is A. if no letter is used more than once in an arrangement in the list and one three-letter arrangement is randomly selected from the list, what is the probability that the arrangement selected will be DCA?
英語人氣：232 ℃時間：2020-05-08 17:43:35
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