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01-06-2017
Mathematics

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Which of the following is an example of a combination?

A. The number of ways 12 picture frames can be arranged on a shelf.
B. The number of ways 3 people can sit on a couch.
C. Selecting a first, second and third place winner at a beauty competition.
D. Picking 4 sets of towels out of 20 different sets.

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jimthompson5910 jimthompson5910

01-06-2017

A is a permutation since order matters.

B is also a permutation. Order matters here.

C is yet another permutation.

D is a combination because the order of towels doesn't matter.

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Answer: Choice D

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