Question 419360
A BOX CONTAINS 12 RED T-SHIRTS AND 18 BLACK T-SHIRTS. 
FIND THE PROBABILITY OF RANDOMLY SELECTING 3 DIFFERENT BLACK T-SHIRTS IN SUCCESSION.....
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Ans = (18/30)(17/29)(16/28) = 18C3/30C3 = 0.200985
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Cheers,
Stan H.