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A group of volunteers consists of nine grade-11 students and six grade-12 students.If six people are chosen at random. a) What is the probability that

A group of volunteers consists of nine grade-11 students and six grade-12 students.If six people are chosen at random.

a) What is the probability that there is an equal number from each grade selected?

b) What is the probability there will be at least one grade-12 student selected?

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