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[nhatquangsin]

CM$\left [ \frac{(n-1)!}{n} \right ]\vdots n-1$ với $n\geq 5$

 

[PRONOOBCHICKENHANDSOME]

$(n-1,n)=1 , (n-1)! \vdots n \Rightarrow \frac{(n-1)!}{n} \vdots (n-1)$ 

Edited by PRONOOBCHICKENHANDSOME, 11-06-2013 - 20:11.