document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=842485>Question 842485</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 3,7,17,39,85,? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #507571 by </B><A HREF=/tutors/aboutme.mpl?userid=TheInstructor><B>TheInstructor(29)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TheInstructor><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=507571\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi,\r<BR>\n" );
document.write( "\n" );
document.write( "Firstly this is not sequences and series, simply asking you to find the next number.\r<BR>\n" );
document.write( "\n" );
document.write( "Attempt to find the difference betweeen the numbers<BR>\n" );
document.write( "7 -3 = 4<BR>\n" );
document.write( "17-7 = 10<BR>\n" );
document.write( "39-17 = 22<BR>\n" );
document.write( "85-39 = 46\r<BR>\n" );
document.write( "\n" );
document.write( "Calculate the differences between: 10-4 = 6 , 22-10 = 12 , 46- 22 = 24 (Notice the pattern!!!!)\r<BR>\n" );
document.write( "\n" );
document.write( "Therefore since the difference is being multiplied by 2, your next number's difference will be 48\r<BR>\n" );
document.write( "\n" );
document.write( "So 85+ 48 = 133 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );