4个数字选3个有多少组合

简介：Qin Fen, let me introduce to you. They are all my most central subordinates. This is the only gold-level agent, my deputy, named Tiezhong. The other nine are all silver-level agents. You Just knowing each other is enough, this time they can be considered as taking advantage of you. Tie Zhuihun pointed at the few people who came out.