As Plato said before, please type them out - it's easier to quote and to follow the thread if there are more responses.

Nr. 46:

First: how many table arrangements with 8 people are there if the table were a long table (or if you want, a police line-up)?

Then, how many are the same if you take rotations at a round table into account?

Nr. 20:

In a polygon with n sides (n >= 3), a diagonal from edge-1 can go to which of the other edges?