<PRE><B>Question 187334</B>
 Seven girls and six boys walk into a video store. There are five salespeople available to help them. Find the probability that the salespeople will first help the given numbers of girls and boys.
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P(4 girls or 4 boys)  = P(4 girls) + P(4 boys) = (7C4 + 6C4)/13C4 = 50/715 =0.0699 
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P(all girls or all boys) = P(5 girls) + P(5 boys) = 27/1287 = 0.0210
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P(at least 4 girls or at least 4 boys) = 0.0699 + 0.0210 = 0.0909
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Cheers,
Stan H. 
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