document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=392151>Question 392151</A>: <I><SPAN STYLE=\"word-break: break-all;\"> prove that P(n,n) = 2P(n,n – 2)<BR>\n" );
document.write( "and prove that C(2n,2) = 2C(n,2) + n^2 . <BR>\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 #278327 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=278327\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C%282n%2C+2%29+=+%282n%29%21%2F%28%282n-2%29%212%21%29+=+%28%282n-2%29%21%282n-1%29%282n%29%29%2F%28%282n-2%29%212%21%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%282n-1%29%282n%29%29%2F2+=+2n%5E2+-+n+=+n%5E2+-+n+%2B+n%5E2+=+2%28%28n%28n-1%29%29%2F2%29+%2B+n%5E2 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2C%28n%2C2%29+%2B+n%5E2 ALIGN=MIDDLE  ALT=\"2C%28n%2C2%29+%2B+n%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%28n%2C+n-2%29+=+n%21%2F2%21+=+n%21%2F2 ALIGN=MIDDLE  ALT=\"P%28n%2C+n-2%29+=+n%21%2F2%21+=+n%21%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > ==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2P%28n%2C+n-2%29+=+n%21+=+P%28n%2Cn%29 ALIGN=MIDDLE  ALT=\"2P%28n%2C+n-2%29+=+n%21+=+P%28n%2Cn%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );