document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=257095>Question 257095</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need your help with this geometric series<BR>\n" );
document.write( " a(subscript 1)=4<BR>\n" );
document.write( "r=3<BR>\n" );
document.write( "S (subscript n)=484<BR>\n" );
document.write( "n=? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #189072 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=189072\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I need your help with this geometric series<BR>\n" );
document.write( "a(subscript 1)=4<BR>\n" );
document.write( "r=3<BR>\n" );
document.write( "S (subscript n)=484<BR>\n" );
document.write( "n=?<BR>\n" );
document.write( "----------------------<BR>\n" );
document.write( "a(1) = 4<BR>\n" );
document.write( "r = 3<BR>\n" );
document.write( "----<BR>\n" );
document.write( "S(n) = a(1)[r^n - 1]/[r-1]<BR>\n" );
document.write( "---<BR>\n" );
document.write( "4[3^n -1]/[3-1] = 484<BR>\n" );
document.write( "[3^n -1]/2 = 121<BR>\n" );
document.write( "3^n -1 = 242<BR>\n" );
document.write( "3^n = 243<BR>\n" );
document.write( "3^n = 3^5<BR>\n" );
document.write( "n = 5<BR>\n" );
document.write( "======================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );