) There are 3 red, 4 white and 3 black balls in a box. Find the probability that (i) one ball is drawn and it is a
white colour. (ii) Two balls are drawn and both are of same colour. (iii) Three balls are drawn and all the three
are of different colours.
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Answer:
1.
cases of drawing same colour are selecting 3 from 3 black balls and selecting 3 from 4 white balls
=3C3+4C3
=5
total number of cases =9C3
=84
therefore probability of drawing 3 balls of same colour is
845
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