document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=889429>Question 889429</A>: <I><SPAN STYLE=\"word-break: break-all;\"> All the page numbers of a book are added beginning at page one. However, one page number was mistakenly added twice. The sum obtained was 1000. Which page number was added twice? Do it in details. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538188 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=538188\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> s = ½(2a + (n-1)d)n<BR>\n" );
document.write( "a=1<BR>\n" );
document.write( "d=1\r<BR>\n" );
document.write( "\n" );
document.write( "1000> 1/2*(2 + (n-1))*n<BR>\n" );
document.write( "highest n=44\r<BR>\n" );
document.write( "\n" );
document.write( "s = ½(2 + (43))44<BR>\n" );
document.write( "s = 45*22<BR>\n" );
document.write( "s=990<BR>\n" );
document.write( "1000-990=10<BR>\n" );
document.write( "10 was repeated twice </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );