Posted by Anonymous on Monday, October 22, 2012 at 1:53am.
take prob that they are both different
first can be anything, the second must be one of the other 54
prob that they are both different = (1)(54/55) = 54/55
prob( they are NOT both different)
= prob(at least two are the same) = 1 - 54/55 = 1/55
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