11.7 The Fundamental Counting Principle and Permutations

Question 1

Permutation

Answer 1

Any ordered arrangement of a given set of objects (always assume repetition isn’t permitted)

Question 2

N factorial (n!)

Answer 2

Ex: 3! = 3 × 2× 1
5! = 5 × 4 × 3 × 2 × 1

Question 3

Permutation formula

Answer 3

(n)P(r) = (n!) / ((n - r)!)
(n)P(r) read as “n choose r”