Jim F.

asked • 11/08/19

You plan to take a simple random sample of 3 students from a class of 12 students so that you can measure their heights. How many different samples are possible?



You plan to take a simple random sample of 3 students from a class of 12 students so that you can measure their heights. How many different samples are possible?



(A) 12 (B) 6 (C) 1320 (D) 220 (E) 36

1 Expert Answer

By:

Jim F.

thank you! What's the base formula for combinations problem?
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11/08/19

Eric M.

tutor
Let n be the number of items you have to choose from (in this case 12) and r be the number you're picking (in this case 3). The number of combinations is n!/(r!*(n-r)!)
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11/08/19

Jim F.

thank you so much Eric
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11/08/19

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