document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=720706>Question 720706</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let U = {5, 10, 15, 20, 25, 30, 35, 40}<BR>\n" );
document.write( "     A = {5, 10, 15, 20}<BR>\n" );
document.write( "     B = {25, 30, 35, 40}<BR>\n" );
document.write( "     C = {10, 20, 30, 40}.<BR>\n" );
document.write( "Find A  &#8898;  C.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441933 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20849)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=441933\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> in &#8898; you have all <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ {x\,\in\,\mathbb{A}\,and x\,\in\,\mathbb{C}\\">\r<BR>\n" );
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document.write( "A = {5, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2810%29 ALIGN=MIDDLE  ALT=\"highlight%2810%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, 15, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2820%29 ALIGN=MIDDLE  ALT=\"highlight%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > }<BR>\n" );
document.write( "C = { <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2810%29 ALIGN=MIDDLE  ALT=\"highlight%2810%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%2820%29 ALIGN=MIDDLE  ALT=\"highlight%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, 30, 40}....as you can see <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ {10\,\in\,\mathbb{A}\,and  10\,\in\,\mathbb{C}\\"> , and  <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ {20\,\in\,\mathbb{A}\,and  20\,\in\,\mathbb{C}\\">\r<BR>\n" );
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document.write( "so,\r<BR>\n" );
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document.write( "A  &#8898;  C={10,20} </SPAN>\n" );
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