There are 15 black and 5 white balls. Find the probability of drawing 3 balls so that there is no white ball.

• 15C3 / 20C3
• 10 years agoHelpfull: Yes(17) No(0)
• probabiliy to draw 3 balls out of 20=20c3=1140
  now no balls will be white.so every balls are black
  so probability of black balls are=12c3=455
  so ans is 1140/455
• 11 years agoHelpfull: Yes(0) No(19)
• 14C3/20C3...
• 10 years agoHelpfull: Yes(0) No(11)