第一个确定是D
然后后面的定有一个是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数学题,有关概率A, B, C, D ,E , F, Ga list consists of all possib
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