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Mathematics 17 Online
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?

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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