document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=539743>Question 539743</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the sum of numbers  between 0 and 270 which are divisible by 3 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #353558 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=353558\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> what is the sum of numbers  between 0 and 270 which are divisible by 3<BR>\n" );
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document.write( "The numbers form an arithmetic sequence: 0,3,6,9,...<BR>\n" );
document.write( "The common difference is 3 and the 1st term is 0.<BR>\n" );
document.write( "The sum of the 1st n terms of an arithmetic sequence is<BR>\n" );
document.write( "S(n) = n/2(a_1 + a_n)<BR>\n" );
document.write( "The number of terms, n = 91<BR>\n" );
document.write( "So the sum is S(91) = 45.5*(0+270) = 12285<BR>\n" );
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