Hello guys,   
      
   I need to solve a probability question, need help.   
   maybe it's a simple math quiz for you.   
   so if i could get help here,   
   thanks in advance.  :)   
      
   There are  total 300 marble balls, yellow*100 + green*100 + black * 100,   
   if I pick 3 balls in once time   
   (not one by one,and no put them back after picked up.)   
      
   how to calculate the probability for 1*yellow + 1*green + 1*black.   
      
   ps. I really know it's not a database question. :p   
      
   Violin. :)   
      
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