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Asked Dec 29, 2019
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In Exercises 5–36, express all probabilities as fractions.

Sorting Hat  At Hogwarts School of Witchcraft and Wizardry, the Sorting Hat chooses one of four houses for each first-year student. If 4 students are randomly selected from 16 available students (including Harry Potter), what is the probability that they are the four youngest students?

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Step 1

Here, n = 16, r = 4.

The first-year students are selected is not of importance here. What matters is that which 4 first-year student...

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