Beethoven wrote nine symphonies and Mozart wrote $27$ piano concertos. What situation could this function describe?  

1. 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?

   Answer (a):

   $9(27)=243$

2. 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 continue before exactly the same program would have to be repeated?

   Hint (b):

   Combine the ways of part (a) with the $15$ Schubert string quartets.