document.write( "Question 523772: Two-digit numbers are made up from the digits 0, 1, 2, and 3. How many numbers can be made if 0 cannot be the first digit and the repetition of digits is allowed? \n" ); document.write( "
Algebra.Com's Answer #347415 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "When making a two-digit number,\r\n" );
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document.write( "you can choose the first digit any of 3 ways, 1, 2, or 3.\r\n" );
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document.write( "For each of those 3 ways to choose the first digit, there\r\n" );
document.write( "are 4 ways to choose the second digit, either 0, 1, 2, or 3.\r\n" );
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document.write( "So that's 3×4 or 12 ways in all  Here are all 12 ways:\r\n" );
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document.write( " 1.  10\r\n" );
document.write( " 2.  11\r\n" );
document.write( " 3.  12\r\n" );
document.write( " 4.  13\r\n" );
document.write( " 5.  20\r\n" );
document.write( " 6.  21\r\n" );
document.write( " 7.  22\r\n" );
document.write( " 8.  23\r\n" );
document.write( " 9.  30\r\n" );
document.write( "10.  31\r\n" );
document.write( "11.  32\r\n" );
document.write( "12.  33\r\n" );
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document.write( "Edwin
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