document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=862763>Question 862763</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the sum of 1st 12 term of the series 3,7,11,15,19 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #519948 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=519948\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3,7,11,15\r<BR>\n" );
document.write( "\n" );
document.write( "is an Arithmetic sequence\r<BR>\n" );
document.write( "\n" );
document.write( "a=3 and d=4\r<BR>\n" );
document.write( "\n" );
document.write( "n=12\r<BR>\n" );
document.write( "\n" );
document.write( "Sn= n/2[2a+(n-1)d]\r<BR>\n" );
document.write( "\n" );
document.write( "S12 =12/2[2*3+(12-1)*4]\r<BR>\n" );
document.write( "\n" );
document.write( "=6[6+44]\r<BR>\n" );
document.write( "\n" );
document.write( "=6*50<BR>\n" );
document.write( "=300\r<BR>\n" );
document.write( "\n" );
document.write( "S12 = 300 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );