a bag has 10 green 5 white and 4 greens balls one ball is drawn at random. what is the proability that it is white
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Total number of ways (N) of selecting 2 balls out of 9 balls (4 red, 3 green and 2 white) is C(9,2)=36 . Out of a total of 9 balls, 3 are green and 6 are not green. So, number of ways (n) of selecting 2 not green balls is C(6,2)=15. Hence, the required probability is nN=1536=512
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