Introductory permutation problems.

Problem

You have 5 reindeer, Quentin, Balthazar, Jebediah, Lancer, and Rudy, and you want to have 4 fly your sleigh. You always have your reindeer fly in a single-file line.
How many different ways can you arrange your reindeer?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i
Get first 2 correct, or 3 in a row.