find no. of ways u can fill a 3*3 grid with 3 white and 3 black marbles

• Ans: 1680
  
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  nCr = C(n,r)
  
  Filling 9 Place with 3 white ball = C(9,3).
  Remaining place is 9-3=6, thus filling rest of the place = C(9-3, 3) =20
  
  Total = C(9,3)*C(9-3,3) = 84*20 = 1680
• 11 years agoHelpfull: Yes(23) No(0)
• 9C3=84;
  6C3=20;
  84*20=1680
• 11 years agoHelpfull: Yes(7) No(0)
• it was 6 black marbles nd 3 white marbles.....
  so it should to be----- 9C3
• 11 years agoHelpfull: Yes(0) No(0)