[填空题]
A professor and five of his students attend a talk go*fp9h :ebzwp:f7z-c iven in a lecture sei8:fw7 pz+ 4oxyhllt ;ries. They have a row of 8l poy;l t+:xf zhw874i seats to themselves.
Find the number of ways the professor and his students can sit if
1. the professor and his students sit together.
2. the students decide to sit at least one seat apart from their professor.
