document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=247854>Question 247854</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Question: Find the sums of the following geometric series. 1 + 3 + 9 +...+2187.\r<BR>\n" );
document.write( "\n" );
document.write( "What I've tried so far...<BR>\n" );
document.write( "So: know:a=1<BR>\n" );
document.write( "         r=3<BR>\n" );
document.write( "         tn=2187<BR>\n" );
document.write( "    find:???\r<BR>\n" );
document.write( "\n" );
document.write( "For this problem, wouldn't I have to find how many terms are in the sequence first? Then whatever n is, I plug that into another equation?\r<BR>\n" );
document.write( "\n" );
document.write( "I'm so lost...please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #180736 by </B><A HREF=/tutors/aboutme.mpl?userid=mathitutor><B>mathitutor(25)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathitutor><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=180736\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is a standard geometric progression,\r<BR>\n" );
document.write( "\n" );
document.write( "3^0 + 3^1 + 3^2 + ... + 3^7\r<BR>\n" );
document.write( "\n" );
document.write( "There is a standard formula for summation of terms of a geometric progression series. Use that to solve this. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );