Homework Help: math

Posted by John on Wednesday, May 26, 2010 at 4:13pm.

A bag contains 7 blue marbles, 5 red marbles, and 9 green marbles. A marble is taken at random from the bag. What is the probability that the marble is blue or red? Please type in your answer as a fraction.

math - PsyDAG, Thursday, May 27, 2010 at 12:27pm
Either-or relationships require adding the probabilities of the individual events.

7/21 + 5/21 = ?
math - shuria, Thursday, January 5, 2012 at 10:28pm
12/21

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