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Mathematics, 24.03.2021 23:10 lovethenae12

Ms. Vallow's cohort is decorating cookies for the middle school bake sale. There are 18 cohorts at the middle school and 4 of them are eighth graders. What is the probability that an eighth grade cohort will get to purchase cookies first? Also,
If there are 5 seventh grade cohorts, what is the probability that a seventh grade cohort WILL NOT get to purchase cookies first?

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