document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1072909>Question 1072909</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many four-digit numbers can be formed using the digits 1,2,3,4,5,6,7,8, and 9.<BR>\n" );
document.write( "a) if repetition is allowed?<BR>\n" );
document.write( "b) if repetition is not allowed?<BR>\n" );
document.write( "c) How many of 4 digits numbers in (a) are greater than 6000?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #687802 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=687802\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a)<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=N=9%2A9%2A9%2A9=6561 ALIGN=MIDDLE  ALT=\"N=9%2A9%2A9%2A9=6561\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "b) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=N=9%2A8%2A7%2A6=3024 ALIGN=MIDDLE  ALT=\"N=9%2A8%2A7%2A6=3024\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "c) Look at numbers starting in 6,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=N=9%2A9%2A9 ALIGN=MIDDLE  ALT=\"N=9%2A9%2A9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Same number for numbers starting in 7,8, and 9.<BR>\n" );
document.write( "So there are 4 sets of 9*9*9.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=N%5Btot%5D=4%2A9%2A9%2A9 ALIGN=MIDDLE  ALT=\"N%5Btot%5D=4%2A9%2A9%2A9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=N%5Btot%5D=2916 ALIGN=MIDDLE  ALT=\"N%5Btot%5D=2916\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "</TD></TR></TABLE>\n" );