Question

Evaluate: 5P5. it's for permutations. someone help pls

Answer 1

Answer:

120

Step-by-step explanation:

Using the definition

n$P_{r}$ = n! / (n - r ) !

where n! = n(n - 1)(n - 2) ....... × 3 × 2 × 1

Hence

5$P_{5}$ = 5! / 0! = 5! ← 0! = 1

5$P_{5}$ = 5! = 5 × 4 × 3 × 2 × 1 = 120