(iii) A bag contains 3 red, 3 white and 3 green balls of the same size. One ball is
taken out of the bag at random, what is the probability that the ball picked up
is (1) red (2) either white or green.
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Total number of balls= 3+3+3
=9
Number of red and white balls= 3+3
Therefore required probability=
NUMBER OF RED AND WHITE BALLS upon TOTAL NUMBER OF BALLS
6 upon 9=
2 upon 3
hence the probability a ball drawn is either red or white= 2 upon 3
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