document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=358378>Question 358378</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a certain town can use the digits 0, 1, 2, 3, 7, and 9 for it's telephone prefixes. how many 3-digit telephone prefixes are possible for this town if each digit can be used only once in a prefix and the first digit cannot be a 1 or a 0? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #255766 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=255766\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> nPr=permutations of n things taken r at a time.<BR>\n" );
document.write( "6P3=120 Think of the 120 as 6 columns of 20 three digit numbers whose initial number stays the same throughout each column and that the columns beginning with 0 and one are not allowed.<BR>\n" );
document.write( "120 * 4/6 = 80 <BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );