Question

np4=1680=n!
find the n!​

Answer 1

Answer:

nPr = n! / (n - r)!

nP4 = n! / (n - 4)!

n! / (n - 4)! = 1680

n! = 1680 * (n - 4)!

n * (n - 1) * (n - 2) * (n - 3) * (n - 4)! = 1680 * (n - 4)!

n * (n - 1) * (n - 2) * (n - 3) = 1680

(n^2 - n) * (n^2 - 5n + 6) = 1680

n^4 - 5n^3 + 6n^2 - n^3 + 5n^2 - 6n = 1680

n^4 - 6n^3 + 11n^2 - 6n - 1680 = 0

Step-by-step explanation:

hope it help uuu...