document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=236106>Question 236106</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1-2 + 3 -4 + ....-98 + 99 equals\r<BR>\n" );
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document.write( "a) -50  b)  -49  c)  0  d) 49  e) 50 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #173875 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=173875\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1-2 + 3 -4 + ....-98 + 99 equals <BR>\n" );
document.write( "a) -50 b) -49 c) 0 d) 49 e) 50<BR>\n" );
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document.write( "There are 99 numbers<BR>\n" );
document.write( "Pair them up:<BR>\n" );
document.write( "1+99 = 100<BR>\n" );
document.write( "-2-98 = -100<BR>\n" );
document.write( "3+97 = 100<BR>\n" );
document.write( "etc.<BR>\n" );
document.write( "The pairs are alternately +100 and -100, until you get to -50.  It has nothing to pair with, so the sum is <BR>\n" );
document.write( "-50<BR>\n" );
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