Beethoven wrote nine symphonies and Mozart wrote 27 piano concertos. Homework Help ✎
If the local radio station KALG wants to play two pieces, a Beethoven symphony and then a Mozart concerto, in how many ways can this be done?
The station manager has decided that on each successive night (seven days a week), a Beethoven symphony will be played, followed by a Mozart concerto, followed by a Schubert string quartet (there are 15 of those). How long could this policy be continued before exactly the same program would have to be repeated?
= 243 ways