the tree Posted December 21, 2005 Share Posted December 21, 2005 I know that to find the sum of an arithmetic series I'd use [math]S=\frac{n}{2}[2a+(n-1)d][/math] but what do I do if I want the product of an arithmetic series (all the values multiplied together nicely)? Link to comment Share on other sites More sharing options...
Dave Posted December 22, 2005 Share Posted December 22, 2005 Sorry, not sure what you mean by the question. Do you mean that for your arithmetic series [imath]\sum_n a_n[/imath] you'd want to find [imath]\prod_n a_n[/imath] or what? Link to comment Share on other sites More sharing options...
the tree Posted December 22, 2005 Author Share Posted December 22, 2005 I think that's it but I don't recognise the symbol you've used. Like, what's the value of the the first [math]x[/math] terms of a sequence [math]a+(n-1)d[/math] when they're all multiplied together? Link to comment Share on other sites More sharing options...
clarisse Posted December 22, 2005 Share Posted December 22, 2005 hope this helps... otherwise... no idea: http://en.wikipedia.org/wiki/Arithmetic_series#Product Link to comment Share on other sites More sharing options...
the tree Posted December 23, 2005 Author Share Posted December 23, 2005 Wow thanks. Now all I need to do is to understand gamma functions and I'm set. lol. Link to comment Share on other sites More sharing options...
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