求助几个GRE的数学题1,from the set of 6 letters,A,B,C,D,E and F,there are 20 different 3-letter subsets that could be selected.A:the number of 3-letter subsets that include FB:102,10,15,25,30,xif d is the standard deviation of the numbers in t
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新GRE数学题求助>
求助几个GRE的数学题1,from the set of 6 letters,A,B,C,D,E and F,there are 20 different 3-letter subsets that could be selected.A:the number of 3-letter subsets that include FB:102,10,15,25,30,xif d is the standard deviation of the numbers in t
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