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20 10 how to do the 8 th multiple-choice question of Hubei mathematics (science) in the college entrance examination?
Classified discussion

Consider driving first. If there are two people, choose from the other three: C3, 2. The remaining three people will also work for A3, 3.

If the driver is a person, choose one from three people: C3, 1, and the remaining four or three positions are C4, 2a3 and 3 (grouping mode).

The total is 126.

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