document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=28617>Question 28617</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Conjecture a formula for 1*2+2*3+3*4+....n(n+1).<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #15655 by </B><A HREF=/tutors/aboutme.mpl?userid=venugopalramana><B>venugopalramana(3286)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=venugopalramana><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.geocities.com/venugopalramana/FREE_MATHS_ASSISTANCE.html valign=middle><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=15655\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> conjecturea formula for 1*2+2*3+3*4+...+n(n+1)=SN<BR>\n" );
document.write( "SN=SIGMA{N(N+1)}=SIGMA(N^2)+SIGMA(N)<BR>\n" );
document.write( "=N(N+1)(2N+1)/6 +N(N+1)/2...I HOPE YOU ARE TAUGHT THESE FORMULAE..IF NOT PLEASE COME BACK ..I SHALL GIVE ANOTHER WAY TO GO ABOUT THIS PROBLEM..<BR>\n" );
document.write( "={N(N+1)/2}{(2N+1)/3 + 1}<BR>\n" );
document.write( "={N(N+1)/2}{(2N+1+3)/3 }<BR>\n" );
document.write( "=={N(N+1)/2}{2(N+2)/3}<BR>\n" );
document.write( "=N(N+1)(N+2)/3  </SPAN>\n" );
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