document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=888397>Question 888397</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In an AP the first term is 4 and the nth term is 36. Given that the sum of the first n terms is\r<BR>\n" );
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document.write( "363, find n and the common difference of the AP.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #537389 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=537389\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> S = ½(a + an)n<BR>\n" );
document.write( "363 = ½(4 + 36)n<BR>\n" );
document.write( "363 = ½(40)n<BR>\n" );
document.write( "363 = 20n<BR>\n" );
document.write( "363/20=n<BR>\n" );
document.write( "n=18.15 which is not possible<BR>\n" );
document.write( "n must be a positive integer\r<BR>\n" );
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