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[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/session.php on line 580: sizeof(): Parameter must be an array or an object that implements Countable
[phpBB Debug] PHP Warning: in file [ROOT]/phpbb/session.php on line 636: sizeof(): Parameter must be an array or an object that implements Countable
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20150070190

Posted: Sat Oct 07, 2017 5:48 pm

by ada

$S_n=\frac{{\bf a}(1-r^n)}{1-r}$