document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=11118>Question 11118</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the sum of the 1st 500 counting digits? That is what is the sum of 1+2+3+4+...+499+500?  How about the sum of only the odd digits, 1+3+5+...+497+499? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #5813 by </B><A HREF=/tutors/aboutme.mpl?userid=askmemath><B>askmemath(368)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=askmemath><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=5813\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Sum of the first n counting digits = n(n+1)/2<BR>\n" );
document.write( "So for first 500 = 500x501/2 = 250 x 501 = 125250\r<BR>\n" );
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document.write( "Sum of first n odd numbers = n^2<BR>\n" );
document.write( "Check:<BR>\n" );
document.write( "Sum of first 3 odd numbers = 1+3+5 = 9<BR>\n" );
document.write( "n^2 = 3^2 = 9  Yay!! </SPAN>\n" );
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