SOLUTION: I have a problem with question: an urn contains 7 red, 5 blue, and 6 green marbles. If one marble is selected at random, what is the probability that it is not red?
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Question 939456: I have a problem with question: an urn contains 7 red, 5 blue, and 6 green marbles. If one marble is selected at random, what is the probability that it is not red? Answer by mathmate(429) (Show Source):
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Given:
Urn containing 7 red (R), 5 blue (B) and 6 green (G) marbles.
Find probability of picking at random a marble which is not red.
Solution:
Total number of marbles =
Number of marbles which are not red =
Probability of picking a marble which is not red
P(~R)=
Answer: probability of picking a marble which is not red is
