document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=39509>Question 39509</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the sum of the first n terms of the given arithmetic series.<BR>\n" );
document.write( "a2=-6, a5=-18 (n=8) </SPAN>\n" );
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document.write( "a2=-6, a5=-18 (n=8)<BR>\n" );
document.write( "A2=A+D=-6......................I<BR>\n" );
document.write( "A5=A+4D=-18.................II<BR>\n" );
document.write( "3D=-18+6=-12<BR>\n" );
document.write( "D=-4<BR>\n" );
document.write( "A=-6+4=-2<BR>\n" );
document.write( "SN=(N/2){2*-2+(N-1)(-4)}=(N/2){-4-4N+4}= -2N^2<BR>\n" );
document.write( "S8=-2*8^2=-128 </SPAN>\n" );
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