英语翻译
A mathematical problem which,under the help of large water jet ah thank you thank you!6 from 4 volunteers were chosen to engage in translation,guided tours,guide,Procter & Gamble.Teachers 5 different 2 A and B were not engaged in the translation,the program sent a total of ()
应该是选中的4人
那么如果是6人中又是什么情况