Answers

2014-06-02T18:35:02+05:30
For selecting 6 balls so that atleast two balls of each colours = 5c2*6c4 + 5c3*6c3 + 5c4*6c2
          = 10*15 + 10*20 + 5*15 
          =150 + 200 + 75
            = 425              
0
  • nyx
  • Helping Hand
2014-06-03T11:39:43+05:30
For selecting 6 balls so that atleast two balls of each colours = 5c2*6c4 + 5c3*6c3 + 5c4*6c2
          = 10*15 + 10*20 + 5*15 
          =150 + 200 + 75
            = 425      
0