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OpenStudy (anonymous):
Seven CDs can be arranged into 21 combinations of 2. TRUE FALSE
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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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