document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=850091>Question 850091</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Five locks and five keys of lock fall down to the  ground. Then how many tries are needed  match each lock with its correct key? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #512037 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=512037\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> take key one try it in 5 locks<BR>\n" );
document.write( "you find it on last try\r<BR>\n" );
document.write( "\n" );
document.write( "take key 2 and try it in 4 locks and find it on last try.<BR>\n" );
document.write( "5+4<BR>\n" );
document.write( "take key 3 and try it on 3 locks<BR>\n" );
document.write( "now two locks\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "one key left and it must work.\r<BR>\n" );
document.write( "\n" );
document.write( "5+4+3+2=14 tries to be sure.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );