document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=213951>Question 213951</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Am totally new to sequences and kinda lost on this problem.  Need help for mathletes competition tomorrow\r<BR>\n" );
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document.write( "What is the 21st term of the sequence 3,6,12,24 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #161618 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=161618\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the 21st term of the sequence 3,6,12,24<BR>\n" );
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document.write( "1st determine if the sequence is arithmetic or geometric<BR>\n" );
document.write( "Yours is geometric with a(1)=3 and r=2<BR>\n" );
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document.write( "2nd: Form for the nth term:<BR>\n" );
document.write( "a(n) = {a(1))r^(n-1)<BR>\n" );
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document.write( "3rd: a(21) = 3*2^20 = 3* 1048576 = 3145728<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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