You need to put your reindeer, Lancer. Prancer, Gloopin, and Bloopin, in a single-file line to pull your sleigh.
However, Prancer and Lancer are fighting, so you have to keep them apart, or they won't fly.
How many ways can you arrange your reindeer?

Five reindeer: You need to put your reindeer, Gloopin, Balthazar, Bloopin, Prancer, and Quentin, in a single-file line to pull your sleigh. However, Prancer and Balthazar are best friends, so you have to put them next to each other, or they won't fly.

Step-by-step explanation: