Question

f"Pr_2= 60, then find the value of n.​

Answer 1

Answer:

5

Step-by-step explanation:

Pn−2=60

⇒{n−(n−2)}!n!=60

⇒(n−n+2)!n!=60

⇒2!n!=60

⇒n!=60×2!

⇒n!=60×2×1

=120

⇒n!=5!

On comparing n=5