Question

ajutat jfjejsuwwnejjjfjf

Answer 1

Probabil e vorba de ecuatia $\frac{P_{n-3} }{P _{n-5} }=12,deci,(n-3)!=12(n-5)!,sau,(n-5)!(n-4)(n-3)=$$=12(n-5)!,simplificand,rezulta,(n-4)(n-3)=12=3*4$, deci n-4=3, adica n=7.