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.

Quantity A

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

Quantity B

10

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：C

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Quantitative Comparison

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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