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Using it's concept, it is found that the probability that the selected student is wearing a black shirt is given by:
A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.
In this problem, we have that out of n + 6 + 9 = n + 15 students, n are wearing black shirts, hence the probability is given by:
More can be learned about probabilities at brainly.com/question/14398287
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