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Mathematics 15 Online
OpenStudy (anonymous):

Seven CDs can be arranged into 21 combinations of 2. TRUE FALSE

OpenStudy (anonymous):

@mathmate

OpenStudy (anonymous):

@ig

OpenStudy (mathmate):

You can apply the same formula as given in the reply to: http://openstudy.com/users/mathmate#/updates/548851b7e4b079b941e7a693 If you wish, you could post your answer for checking.

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