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A school choir has 80 students; 36 of them are in seventh grade. Also, 40...

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A school choir has 80 students; 36 of them are in seventh grade. Also, 40 students in the choir are girls: 18 of them are in seventh grade. What is the probability that a student picked at random from the choir is either a girl or is in seventh grade?A. 27/40B. 29/40C. 13/40D. 33/40

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