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An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. What is the probability that the ball drawn is not red?

1/11
9/20
2/11
11/20

Correct Answer: 11/20

Explanation:

P (red) = 9 / (9 + 7 + 4) = 9/20
∴ P(not-red) = (1 - 9/20) = 11/20

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