6. An urn contains 3 red, 5 blue, 4 green and 6 orange marbles. A marble is drawn from the urn at random. What is the probability that it is: (a) a green marble? (b) not a red marble? (c) either blue or orange marble? (d) an orange marble?
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Total sample space = 18
a) P(green marble)=4/18=2/9
b) P(not a red marble )=1-3/18=18-3/18=15/18
c) P(either blue or orange)=5/18+6/18=11/18
d)P(an orange marble)=6/18
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