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Posted by **Robert** on Monday, December 5, 2011 at 12:00pm.

(3n+1)!*3!/(3n-2)!

- precalculus -
**Reiny**, Monday, December 5, 2011 at 12:16pm(3n+1)!*3!/(3n-2)!

= (3n+1)(3n)(3n-1)(3n-2)!3!/(3n-2)!

= 18n(9n^1 - 1)

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