排三组三概率是多少

简介：Ma Ke and Zhang Mingzhen did not have telescopes, so they could not see the expressions on the faces of the soldiers who built the city. However, from the top of the city, it was neat and quiet. No one moved around. Everyone stood by the wall, holding weapons, looking coldly at the bottom of the city. You can know that the defenders at the top of the city are by no means easy to deal with.