document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1099807>Question 1099807</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A credit card number has 16 digits between 0 and 9 inclusive.If only 100 million numbers are valid, what is the probability that a number that is entered ramdomly is valid?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #714296 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=714296\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A credit card number has 16 digits between 0 and 9 inclusive.If only 100 million numbers are valid, what is the probability that a number that is entered ramdomly is valid? <BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Assuming leading zeroes are allowed, ie, 0000000000000001 is used:<BR>\n" );
document.write( "1e8/1e16 = 1e-8<BR>\n" );
document.write( "--> 0.00000001<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "If leading zeroes not allowed:<BR>\n" );
document.write( "--> 1e8/9e15<BR>\n" );
document.write( "= 1/(9e7)\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );