其它
For a positive integer $n$, the factorial notation $n!$ repressents the product of the integer from $n$ to $1$, (For example, $6!=6\times5\times4\times3\times2\times1$.) What value of $N$ satisfies the following equation?  $$6!\times8!=8\times N!$$ 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples
$6!=10\times9\times8$, $$6!\times8!=8\times 10!$$. 