document.write( "Question 1181318: How many four-digit numbers can be
\n" ); document.write( "formed using the digits 1, 2, 3, 4, 5, 6, if the four-digit number is odd?
\n" ); document.write( "(Repetition is allowed) \n" ); document.write( "
Algebra.Com's Answer #811192 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "In such problems as these, always make the most restrictive choices first.\r\n" );
document.write( "\r\n" );
document.write( "Here the most restrictive choice is the last digit, so we choose it first.\r\n" );
document.write( "\r\n" );
document.write( "Choose the last (or fourth) digit any of 3 ways. (either 2, 4, or 6)\r\n" );
document.write( "Choose the first digit as any of 6 ways.\r\n" );
document.write( "Choose the second digit as any of 6 ways.\r\n" );
document.write( "Choose the third digit as any of 6 ways.\r\n" );
document.write( "\r\n" );
document.write( "That's (3)(6)(6)(6) = 648 ways.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );