概率题,话说是英文的,
tenpeoplearetobeseatedatarectangulartablefordinner.Tanyawillsitattheheadofthetable.HenrymustnotsitbesideeitherWilsonorNancy.Inhowmanywayscanthepeoplebeseatedfordinner?
我不知道那群人应该怎么坐,THEHEADOFTHETABLE指的是什么?还有那个是单面坐还是双面坐?
BUTANYWAYTHANKYOU