document.write( "Question 697698: How many odd numbers of three digits each can be formed from the digits 2,4,6 and 7 if repetition of digits is permitted. \n" ); document.write( "
Algebra.Com's Answer #430229 by Edwin McCravy(20055)![]() ![]() You can put this solution on YOUR website! Odd numbers end in an odd digit. There is just one odd digit, 7, \n" ); document.write( "so we can choose the third digit just 1 way.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( "we can choose the 1st digit any of 4 ways \n" ); document.write( "we can choose the 2nd digit any of 4 ways \n" ); document.write( "we can choose the 3rd digit just 1 way (as 7),\r \n" ); document.write( "\n" ); document.write( "So the number of ways is 4 = 16 ways\r \n" ); document.write( "\n" ); document.write( "They are:\r \n" ); document.write( "\n" ); document.write( "227, 247, 267, 277, \n" ); document.write( "427, 447, 467, 477, \n" ); document.write( "627, 647, 667, 677, \n" ); document.write( "727, 747, 767, 777.\r \n" ); document.write( "\n" ); document.write( "Edwin \n" ); document.write( " |