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?

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): You can put this solution on YOUR website!

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
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