Question

Resolva a equação fatorial: a) ( n-1 )! = 0 / ( n-3 )!

Answer 1

(n-1)(n-1-1)(n-1-2)!
--------------------------=0
       (n-3)!
(n-1)(n-2)(n-3)!
-------------------------=0
       (n-3)!

(n-1)(n-2)=0     n²-3n+2=0     Δ=9-8=1   √Δ=+/-1

n'=3-1/2=2/2===>n'=1

n"=3+1/2=4/2===>n"=2