Question 730920
two representatives are chosen at random from a group of 180 students that has 90 girls and 90 boys. what is the probability that the representatives selected are either both boys or both girls?
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# of same sex pairs: 2*90C2 = 2*4005 = 8010
# of general pairs:: 180C2 = 16110
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P(same sex) = 8010/16110 = 0.4972
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Cheers,
Stan H.