Answer: 12 ways.
Step-by-step explanation:
We need to put your reindeer, Prancer, Quentin, Rudy, and Jebediah, in a single-file line to pull sleigh.
Here , Total reindeer= 4
However , Rudy and Prancer are best friends, so to put them together we consider their pair as one, total objects to arrange = (Rudy and Prancer )(Quentin) (Jebediah) =3
Total ways to arrange 3 things = 3! [By permutations]
Also, Rudy and Prancer can be arranged in 2 ways.
So , total ways to arrange all of them = 2 x 3! = 2 x 3 x 2 x 1 = 12
Hence, we can arrange reindeer in 12 ways.
