document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1167894>Question 1167894</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many four digit number can be formed by using digits 1,3,5,7,7,8 and 9 (No digit should be repeated)?<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 #792569 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=792569\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "The digits can't be repeated, so having the second 7 in the list of available digits is a confusion factor that should be ignored.<br><BR>\n" );
document.write( "There are 6 different digits; you need to make a 4-digit number using four of them.<br><BR>\n" );
document.write( "6 choices for the first;<BR>\n" );
document.write( "5 choices for the second;<BR>\n" );
document.write( "4 for the third; and<BR>\n" );
document.write( "3 for the fourth.<br><BR>\n" );
document.write( "By the fundamental counting principle, the total number of 4-digit numbers possible is the product of the numbers of ways to choose each digit.<br><BR>\n" );
document.write( "ANSWER: 6P4 = 6*5*4*3 = 360 </SPAN>\n" );
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