Answer:
48
Explanation:
Because you have two reindeer that have to be always together you can treat them as a single place in your possibilities. That leaves you with 4 variables and because we are trying to find how many different combinations we can get, we use the formula n!.
In this case n = 4
4! = 4*3*2*1 = 24
You can always switch Prancer and Balthazar so all the options we had so far times 2.
24*2 = 48.