document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=621405>Question 621405</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the unit digit of 7^11^22^23 ?<BR>\n" );
document.write( "The options are=<BR>\n" );
document.write( "(A) 1  (B)3  (C)7  (D)9  . </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #390737 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=390737\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the unit digit of 7^11^22^23 ?<BR>\n" );
document.write( "The options are=<BR>\n" );
document.write( "(A) 1  (B)3  (C)7  (D)9<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "22^23 = xxx.xxx48<BR>\n" );
document.write( "11^(...xxx8) = ...E1 (E is even #)<BR>\n" );
document.write( "--> (C) 7<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );