Posted by Anna on Tuesday, March 30, 2010 at 1:33pm.
A bag contains 7 red chips and 9 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that the two chips are the same color?

Elementary math College  PsyDAG, Wednesday, March 31, 2010 at 2:05pm
To get the first red chip = 7/16, for the second 6/15. The probability of both occurring is found by multiplying the individual probabilities.
To get the first blue chip = 9/16, for the second 8/15. The probability of both occurring is found by multiplying the individual probabilities.
The probability of getting either 2 blue or two red is found by adding the probabilities of your two previous answers.

Elementary math College  Anonymous, Monday, December 6, 2010 at 7:05am
pig

Elementary math College  Anonymous, Tuesday, January 10, 2012 at 6:46pm
2/7
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