document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=556232>Question 556232</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 22 students in Mario's class. Mario's teacher is planning to pair the students up for a project.\r<BR>\n" );
document.write( "\n" );
document.write( "How many different combinations of pairs are possible?\r<BR>\n" );
document.write( "\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 #362091 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=362091\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 22c2 = 22! / (20!*2!) = 231<BR>\n" );
document.write( "they can be paired in 231 combinations.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );