document.write( "Question 1181103: S=n/2(2a(n-1)d) \n" ); document.write( "
Algebra.Com's Answer #810930 by ikleyn(52779)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "If it is supposed to be the formula for the sum of the first n terms of an arithmetic progression,\r
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\n" ); document.write( "\n" ); document.write( "then this formula is written INCORRECTLY in this post.\r
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\n" ); document.write( "\n" ); document.write( "Avoid posting messages with no questions to this forum.\r
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\n" ); document.write( "\n" ); document.write( "Such posts are nonsensical and are a subject of ignoring.\r
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\n" ); document.write( "\n" ); document.write( "Such posts are PROHIBITED at this forum.\r
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