Sunday

April 20, 2014

April 20, 2014

Posted by **matt** on Tuesday, July 15, 2008 at 3:30am.

- maths -
**drwls**, Tuesday, July 15, 2008 at 6:18am[100!/(2!*98!)]*[80!/(78!)(2!)]*20

= [(100*99)/2][(80*79)/2)]*2

= 31,284,000

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