document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=881622>Question 881622</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Dear Sir/Madam:<BR>\n" );
document.write( "    A pleasant day!I have a math problem here involving arithmetic  sequence  Given a sequence a1 , a2 , a3 ................. an     and if a4=4 and a6=6 and an=an-1 + an-2 for n=1, 2, 3…… Find an </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #532576 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=532576\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Do you mean An=A(n-1) + A(n-2)?<BR>\n" );
document.write( " <BR>\n" );
document.write( "A4=A3+A2=4<BR>\n" );
document.write( "A6=A5+A4=6<BR>\n" );
document.write( "A5+4=6<BR>\n" );
document.write( "A5=2<BR>\n" );
document.write( "so we have <BR>\n" );
document.write( "A4=4<BR>\n" );
document.write( "A5=2<BR>\n" );
document.write( "A6=6<BR>\n" );
document.write( "A7=8<BR>\n" );
document.write( "A8=14<BR>\n" );
document.write( "A9=22<BR>\n" );
document.write( "A10=36<BR>\n" );
document.write( "A11=48<BR>\n" );
document.write( "A12=84\r<BR>\n" );
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document.write( "That is not an arithmetic sequence.\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );