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Mathematics 7 Online
OpenStudy (anonymous):

12

OpenStudy (anonymous):

No, this is a problem testing combinations and NOT permutations. You used permutations, P. Combinations is used when order does not matter. Here the order does not matter. So resolve the problem identical to the way you solved it, but use C, combinatiuons, and not P, permutations.

OpenStudy (anonymous):

@Easyaspi314 but it says that no video can be used more then once...doesn't that mean that order does matter?

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