From the set of 6 letter A,B,C,D,E,and F,there are 20 different 3

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From the set of 6 letter A,B,C,D,E,and F,there are 20 different 3-letter subsets that could be selected.

The number of 3-letter subsets that include the letter F

答案：C

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老师你好，这题我没看懂，3letter排列组合出来不是5x4x3=60吗，请问解题思路是什么呢

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