document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=266763>Question 266763</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this Geometric Sequence.<BR>\n" );
document.write( "My teacher doesn't teach very well so it's kind of hard to comprehend everything.<BR>\n" );
document.write( "equation-91st term: 1/5,-1/5,1/5,-1/5,1/5,... </SPAN>\n" );
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document.write( "The first term, a1 = 1/5<BR>\n" );
document.write( "the common ratio = -1.<BR>\n" );
document.write( "----<BR>\n" );
document.write( "From here not sure what you want:<BR>\n" );
document.write( "91st term =1/5<BR>\n" );
document.write( "formula is<BR>\n" );
document.write( "Tn = (1/5)*(-1)^(n-1)<BR>\n" );
document.write( "The infinite sum is a/(1-r) = (1/5) / (1-1/5) = 1/4<BR>\n" );
document.write( "----<BR>\n" );
document.write( "hopefully one of these is what you wanted<BR>\n" );
document.write( " </SPAN>\n" );
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