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OpenStudy (chasemf):
cathy has a nickel, a dime and a quarter. she randomly picks a coin, replaces it then picks another coin. what is the probability that the two coins are of different denominations?
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OpenStudy (fairegaming):
well theres 3 coins.
OpenStudy (mjdennis):
This problem is 'small' enough that you should be able to write down all the possible outcomes in the next 60 seconds. First one is NN, that is she picks a nickel and returns it then gets it again. What are the rest?
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