document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1028854>Question 1028854</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how many 7 digit phone numbers are possible  if consecutive digits must be different?\r<BR>\n" );
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document.write( "is the probability equation of nPr=n!/(n-r)! correct? please help  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #643933 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=643933\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 10 choices for the first digit, and each successive digit has nine possibilities (e.g. if the first digit is 5, then there are 9 choices for the second digit (0-9 except 5)).\r<BR>\n" );
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document.write( "# numbers = 10*9^6\r<BR>\n" );
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document.write( "The equation for permutations nPr has nothing to do with it. </SPAN>\n" );
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