Question

3 balls are drawn randomly from a bag contains 3 black, 5 red and 4 blue balls. what is the probability that the balls drawn contain balls of different colors?

Answer 1

3 balls are drawn ramdomly so
3black ball-1black ball=2balls
5red-1red=4 balls
4blue-1blue=3 balls
so 2+4+3=9
therefore 3/9=1/3 is the probability