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A jury of 12 people is selected from a pool of 30 people that includes 12 men and 18 women what is the probablilty that the jury will be composed of 12 women?
Order does not matter in this case because the order in which the 12 women are chosen won't change the answer. Since order does not matter, a combination is used instead of a permutation.
Therefore the equation would be set up as:
(18 C 12) / (30 C 12) = 0.02%
The numerator is achieved because there are 18 women of the 30 people and 12 women are chosen. The denominator is achieved because there are 30 people in all and 12 people are chosen from those 30 people.
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