document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=355507>Question 355507</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi, I am trying to figure out how combinations/groupings work. If you could give me the steps on how to do it, I would greatly appreciate it.<BR>\n" );
document.write( "Thank You, Jordan </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #253895 by </B><A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><B>sudhanshu_kmr(1152)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><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=sudhanshu_kmr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=253895\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> To solve grouping problems we use combination.\r<BR>\n" );
document.write( "\n" );
document.write( "no. of ways to select r items from total n = nCr = n!/ [ r! * (n-r)!]\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "for example -\r<BR>\n" );
document.write( "\n" );
document.write( " no. of ways to select 2 people from 10 = 10C2 = 45\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "we use combination where problem is related to only grouping of items, \r<BR>\n" );
document.write( "\n" );
document.write( "arrangement is not considered.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "for example- no. of ways to select 3 persons from total 5 names A,B, C, D and E\r<BR>\n" );
document.write( "\n" );
document.write( "here ABC, CBA  and BAC  are same, these form only one group. \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "If your concept have not been cleared, you are welcome for further help\r<BR>\n" );
document.write( "\n" );
document.write( "please feel free to contact.....\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "sudhanshu.cochin@gmail.com  , sudhanshu.cochin@yahoo.com \r<BR>\n" );
document.write( "\n" );
document.write( " \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "    </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );