document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=471953>Question 471953</A>: <I><SPAN STYLE=\"word-break: break-all;\">     a1, a2, a3 , a4............an.........<BR>\n" );
document.write( "in the sequence  above , each term after  the first term  is equal to the preceding  term plus  the constant c. if  a1 + a3+ a5= 27 , what is the  value of a2+ a4? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #323779 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=323779\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The sequence is arithmetic, so we say that\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE a_2 = a_1 + c\">\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE a_3 = a_2 + c = a_1 + 2c\">, and so on.\r<BR>\n" );
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document.write( "Here, since the sum of the 1st, 3rd, 5th terms is 27, we have\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE a_1 + (a_1 + 2c) + (a_1 + 4c) = 27 \Rightarrow a_1 + 2c = 9\">\r<BR>\n" );
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document.write( "The sum of the second and fourth terms is\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE (a_1 + c) + (a_1 + 3c) = 2a_1 + 4c = 2(a_1 + 2c)\">\r<BR>\n" );
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document.write( "This is equal to 2*9 = 18 since we can substitute a_1 + 2c with 9. </SPAN>\n" );
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