Question

Hey this is a permutations question:

If ⁿP₇ = 42 * ⁿP₅ , then what is the value of n?

Answer 1

Here is your answer.

n^2 + n - 12n - 12 =0
n(n+1)-12(n+1) = 0
n-12 = 0
n=12
n+1=0
n=-1

$\huge\green{thank \: you}$