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http://www.codecogs.com/eqnedit.php?latex=%5Cinline%20P_%7Bn%7D%20%5Crightarrow%20P_%7Bn-1%7D | 07:18:54 February 11, 2012

Got an HTTP 301 response at crawl time

Redirecting to...

http://www.codecogs.com/latex/eqneditor.php?latex=%5Cinline%20P_{n}%20%5Crightarrow%20P_{n-1}

Impatient?