A bag contains 3 red balls , 5 white balls and 7 green balls. one ball is drawn out randomly from the bag. find the probability that it is
a) a green ball
b) not a white ball
c) a black ball
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Step-by-step explanation:
Total number of balls =5+6+9
=20
(i) Probability =
Total cases
favourable cases
P(Green) =
20
9
(ii) P(White or red) =
20
5+6
=
20
11
(iii) P(neither green nor white) = P(Red)
=
20
6
=
10
3
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