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Numerade Educator

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Problem 9 Easy Difficulty

Tell whether each situation is a permutation or combination.
How many ways can you buy 2 DVDs from a display of $15 ?$

Answer

$\mathrm{C} ; 105$ ways

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Top Algebra Educators
Anna Marie V.

Campbell University

MG
Maria G.

Numerade Educator

Kristen K.

University of Michigan - Ann Arbor

Michael J.

Idaho State University

Video Transcript

So we're bonds and DVDs and doesn't tell us anything about how we bought them, so it really doesn't matter. And so this is definitely gonna be a combination as well. Um, it's a combination of having 15 items, and we're choosing two of them, so that's gonna be 15 times 14 and then remembering that choosing CD A and CDB or the same as being then a dividing about two times one. So on the top of this we get 210 about about two. So there are 100 and five ways that we could about two CDs from 15.

University of Louisville
Top Algebra Educators
Anna Marie V.

Campbell University

MG
Maria G.

Numerade Educator

Kristen K.

University of Michigan - Ann Arbor

Michael J.

Idaho State University