Second grade class
In a second grade class containing 12 girls and 10 boys, 2 students are selected at random to give out the math papers. What is the probability that the second student chosen is a boy, given that the first one was a girl?
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If a company knows that its new employees have an eighty-five percent learning rate and the first time they perform the task it takes 200 hours. How long will it take to perform the tenth repetition?
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