document.write( "Question 1202481: Find S17 for the series 8 - 4 + 2 - 1+ ... \n" ); document.write( "
Algebra.Com's Answer #837368 by ikleyn(52790)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "        The formula and the final answer/value in the post by @mananth (to which he refers) are incorrect.\r
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document.write( "\"S%5Bn%5D\" = \"a%2A%28%281-r%5En%29%2F%281-r%29%29\"\r\n" );
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document.write( "a = 8\r\n" );
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document.write( "r = -1/2\r\n" );
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document.write( "\"S%5B17%5D\" = \"8%2A%281-%28-0.5%29%5E17%29%29%2F%281-%28-0.5%29%29\"\r\n" );
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document.write( "\"S%5B17%5D\" = 5.3333740234375  (exact value).\r\n" );
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