document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=916353>Question 916353</A>: <I><SPAN STYLE=\"word-break: break-all;\"> imagine the alphabet only consisted of 7 letters abcdefg. If each letter can be use once. how many 4 letter words are possible? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #556021 by </B><A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><B>Edwin McCravy(20056)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><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=Edwin+McCravy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=556021\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There are 7 ways to choose the 1st letter. <BR>\n" );
document.write( "For each of the 7 ways to pick the first letter,<BR>\n" );
document.write( "there are 6 ways left to choose the 2nd letter. <BR>\n" );
document.write( "For each of the 7*6 ways to pick the first 2 letters,<BR>\n" );
document.write( "there are 5 ways left to choose the 3rd letter, <BR>\n" );
document.write( "For each of the 7*6*5 ways to pick the first 3 letters,<BR>\n" );
document.write( "there are 4 ways left to choose the 4th letter.\r<BR>\n" );
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document.write( "In all, that's 7*6*5*4 = 7P4 = 840 ways.\r<BR>\n" );
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document.write( "Edwin</pre> \r<BR>\n" );
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