document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=163575>Question 163575</A>: <I><SPAN STYLE=\"word-break: break-all;\"> determine the number of ways that two letters can be selected from {a b c d} if order in the sample is not to be considered.  list the possible samples </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #120583 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=120583\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a,b,c,d<BR>\n" );
document.write( "[aa,bb,cc,dd]<BR>\n" );
document.write( "ab,ba,ac,ca<BR>\n" );
document.write( "ad,da,bc,cb<BR>\n" );
document.write( "bd,db,cd,dc<BR>\n" );
document.write( "Answer is 16 with repeats.<BR>\n" );
document.write( "Answer is 12 without repeats.<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );