6选3有多少组合

简介：It was quiet in the classroom, and all the students in Class 1 were taking physical education class. Originally, the physical education class was to be changed to mathematics class, because the mathematics of Class 1 only ranked third among the 13 classes, but recently they had a class. After winning the battle and ranking in the first class of the whole grade, Yang Xiaomin couldn't dissipate their enthusiasm, so he let them play.