document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=317258>Question 317258</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Evaluate: 4C0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #237424 by </B><A HREF=/tutors/aboutme.mpl?userid=jrfrunner><B>jrfrunner(365)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jrfrunner><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=jrfrunner><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=237424\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> nCr is a notation for combination of r items selected from a sample of n things.\r<BR>\n" );
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document.write( "nCr= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+n%21%2Fr%21%28n-r%29%21 ALIGN=MIDDLE  ALT=\"+n%21%2Fr%21%28n-r%29%21\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "when r=0  nC0 = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%21%2F0%21%28n-0%29%21 ALIGN=MIDDLE  ALT=\"n%21%2F0%21%28n-0%29%21\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n%21%2Fn%21 ALIGN=MIDDLE  ALT=\"n%21%2Fn%21\"   DISABLED_style= \"max-width:90%; height:auto;\" > =1  since 0! is defined as 1\r<BR>\n" );
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document.write( "so this is true for any \"n\"   nC0=1 </SPAN>\n" );
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