document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1177997>Question 1177997</A>: <I><SPAN STYLE=\"word-break: break-all;\"> P(n,n-1)=6<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #807164 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=807164\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "By definition, P(n,n)=n!<br><BR>\n" );
document.write( "P(3,3) = 3*2*1 = 3!<BR>\n" );
document.write( "P(5,5) = 5*4*3*2*1 = 5!<BR>\n" );
document.write( "etc...<br><BR>\n" );
document.write( "What about P(n,n-1)?<br><BR>\n" );
document.write( "P(3,2) = 3*2 = 6 = 3!<BR>\n" );
document.write( "P(5,4) = 5*4*3*2 = 120 = 5!<BR>\n" );
document.write( "etc...<br><BR>\n" );
document.write( "The only difference between P(n,n-1) and P(n,n) is an additional factor of 1, which of course doesn't change the result.<br><BR>\n" );
document.write( "So P(n,n-1) = n!<br><BR>\n" );
document.write( "Then your problem is to solve<br><BR>\n" );
document.write( "P(n,n-1) = 6 = n!<br><BR>\n" );
document.write( "By inspection, n = 3.<br><BR>\n" );
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