document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1090857>Question 1090857</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Each apartment in a building is identified by 2 characters, 1 letter and 1 number. These consist of the letters A, B, C, and D and the numbers 1, 2, 3, and 4. How many unique apartments are possible given this identification arrangement? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #705306 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52781)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=705306\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "I assume that A1 is an allowable combination, but 1A is NOT allowable,<BR>\n" );
document.write( "although the condition does not state it explicitly.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "If so, then any combination (a character, a number) is allowable, and there are 4*4 = 16 such combinations.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The total number of such distinguishable combinations is 16, so 16 unique identification arrangements are possible.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );