document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1106266>Question 1106266</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If the call letters of radio stations must begin with the letter D, the second letter must be W, X, Y, Z while the third and fourth may be any letter how many different stations can there be?\r<BR>\n" );
document.write( "\n" );
document.write( "a. If a repetition of letter is not allowed?<BR>\n" );
document.write( "b. If repetitions are allowed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #721204 by </B><A HREF=/tutors/aboutme.mpl?userid=math_helper><B>math_helper(2461)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_helper><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=math_helper><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=721204\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "I assume the no repetition applies across all 4 letters of the call letters, not just the last two letters…\r<BR>\n" );
document.write( "\n" );
document.write( "a)  1*4*21*20 = _______________<BR>\n" );
document.write( "b)  1*4*26*26 = _______________ </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );