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In an urn we have balls of various colors: 20 are black, 50 are red, 50 are blue, 60 are green, and 70 are white.

In an urn we have balls of various colors: 20 are black, 50 are red, 50 are blue, 60 are green, and 70 are white. Determines the probabiity of: a. select a red ball. b. select a red or black ball.

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