document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=566666>Question 566666</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the probablity that a seven-digit telephone number has one or more repeated digits? Assume no one digit is more likely than another to be used. In addition, the leading digit cannot be zero. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #366306 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=366306\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the probablity that a seven-digit telephone number has one or more repeated digits? Assume no one digit is more likely than another to be used. In addition, the leading digit cannot be zero.<BR>\n" );
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document.write( "Pattern: ------- where lead digit is not zero<BR>\n" );
document.write( "Total number: 9*10^6 = 9 million with repeates<BR>\n" );
document.write( "Total number with no repeats: 9*9*8*7*6*5*4 = 544320<BR>\n" );
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document.write( "P(1 or more repeated digits) = 1 - (544320]/9000000) = 0.9395<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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