<PRE><B>Question 409323</B>
A teacher has a class consisting of 8 BOYS and 4 GIRLS. How many groups of 5 can he make if: 
-in every group there should be AT LEAST 1 girl?.. 
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P(at least one) = 1 - P(no girls)
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P(no girls) = 8C5/12C5 = 0.071
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P(at least one girl) = 1-0.071 = 0.929..
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Cheers,
Stan H.</PRE>