问一题prep数学，希望有心人可以帮忙解答

house123

    

The positive
integer k has exactly two positive prime factors, 3 and 7.  If k has a total of 6 positive factors,
including 1 and k, what is the value of k ?

    

 

    

(1) 3² is
a factor of k.

    

 

    

(2) 7² is not
a factor of k.

    

 

[此贴子已经被作者于2008-10-23 13:45:28编辑过]

lynne1987

这道题是应该选D吧?

house123

是啊 为什么啊 不明白啊