Question

P(n,4)=6.P(n,3) ise n=?

Answer 1

$\dfrac{n!}{(n-4)!}=6\times\dfrac{n!}{(n-3)!} \Rightarrow \dfrac{n!}{(n-4)!}=6 \times \dfrac{n!}{(n-3)(n-4)!}$(Sadeleştirme yapılırsa)

$n-3=6 \quad \Rightarrow \quad n=9$ olur.