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An urn contains 15 marbles, all identical except for color. Each marble is either black, green, or red. What is the probability of drawing a black or red marble when a single marble is drawn at random from the urn? (1)The number of red marbles is 2. (2)The number of green marbles is 5.

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An urn contains 15 marbles, all identical except for color. Each marble is either black, green, or red. What is the probability of drawing a black or red marble when a single marble is drawn at random from the urn? (1)The number of red marbles is 2. (2)The number of green marbles is 5.






 
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