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January 30, 2015

January 30, 2015

Posted by **Anonymous** on Monday, April 16, 2012 at 11:21pm.

- math -
**Reiny**, Tuesday, April 17, 2012 at 9:10amYou are choosing any pair from 10 choices

the number of such cases = C(10,2)

or 10!/(8!2!) = 45

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