document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=552395>Question 552395</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many combinations of president and vice president can be made in a class of 21?\r<BR>\n" );
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document.write( "Klreddick@AOL.com </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #360268 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=360268\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> P(n,r) = (n!)/((n-r)!)\r<BR>\n" );
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document.write( "P(21,2) = (21!)/((21-2)!)\r<BR>\n" );
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document.write( "P(21,2) = (21!)/(19!)\r<BR>\n" );
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document.write( "P(21,2) = (21*20*19!)/(19!)\r<BR>\n" );
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document.write( "P(21,2) = 21*20\r<BR>\n" );
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document.write( "P(21,2) = 420\r<BR>\n" );
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document.write( "So there are 420 different ways. </SPAN>\n" );
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