document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=321179>Question 321179</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which of these digits is the units digit of the number 9^99 &#8722;4^44?\r<BR>\n" );
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document.write( "A) 4 B) 3 C) 9 D) 5 E) 1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #230020 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=230020\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The units digit of 99^n is<BR>\n" );
document.write( "9,1,9,1,9,1...<BR>\n" );
document.write( "An odd power makes it a 9.<BR>\n" );
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document.write( "The units digit of 4^n is<BR>\n" );
document.write( "4,6,4,6,4...<BR>\n" );
document.write( "An even power makes it a 6.<BR>\n" );
document.write( "9-6 = 3<BR>\n" );
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