document.write( "Question 1207713: In how many ways can a 4-digit code be arranged using 1,2,3,4,5,6,7,8 and 9 \n" ); document.write( "

Algebra.Com's Answer #845734 by ikleyn(52798) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "\r\n" );
document.write( "In all, there are 9 digits from 1 to 9 inclusive.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "If repetition is not allowed, then the number of different 4-digit codes is \r\n" );
document.write( "\r\n" );
document.write( "    9*8*7*6 = 3024.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "If repetition is allowed, then the number of different 4-digit codes is \r\n" );
document.write( "\r\n" );
document.write( "    9*9*9*9 =  = 6561.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "///////////////\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "As the problem is worded/printed in the post, it is a \" lame horse \",
\n" ); document.write( "since it does not specify if repetition is allowed or not.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );