document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1173115>Question 1173115</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How to compute the sum of this series? \r<BR>\n" );
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document.write( "-1+2-3+4-...-(2n-1)+2n </SPAN>\n" );
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document.write( "The given series is 2n terms.<br><BR>\n" );
document.write( "Add the terms in pairs to get a new series of n terms.  In each pair the sum is 1; so the sum of the original series is n(1) = n.<br><BR>\n" );
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