document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=933249>Question 933249</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For the sequence a sub n = 7/3^n, find its fifth partial sum and its nth partial sum.<BR>\n" );
document.write( "Help would truly be appreciated! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #566748 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=566748\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I need to know if you are asking about<BR>\n" );
document.write( "a(sub n) = 7 / (3^n) or<BR>\n" );
document.write( "a(sub n) = (7/3)^n<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "you answered a(sub n) = 7 / 3^n<BR>\n" );
document.write( "note that<BR>\n" );
document.write( "a(sub n) = 7 * ( 1 / 3^n)<BR>\n" );
document.write( "( 1 / 3^n) is a geometric series with a = 1/3 and r = 1/3<BR>\n" );
document.write( "therefore<BR>\n" );
document.write( "sum of n terms = 7 * a * ((1 - r^n) / (1 - r))<BR>\n" );
document.write( "sum of first 5 terms =  7 * (1/3) * ((1 - (1/3)^5) / ( 1 - (1/3))<BR>\n" );
document.write( "sum of first 5 terms = 3.485596708\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );