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You can put this solution on YOUR website!
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document.write( "There are 4 types of 3 digit numbers that can be made witrh them.\r\n" );
document.write( "They are:\r\n" );
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document.write( "ABC, AAB, ABA, ABB\r\n" );
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document.write( "An example of type ABC would be 704.\r\n" );
document.write( "An example of type AAB would be 115.\r\n" );
document.write( "An example of type ABA would be 717.\r\n" );
document.write( "An example of type ABB would be 477.\r\n" );
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document.write( "Case 1: ABC\r\n" );
document.write( "Choose the digit for A any of 5 ways {1,2,4,5,7} (CAN'T choose 0).\r\n" );
document.write( "Choose the digit for B any of the remaining 5 ways (CAN choose 0)\r\n" );
document.write( "Choose the digit for C any of the remaining 4 ways.\r\n" );
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document.write( "Total for case 1: 5*5*4 = 100 ways.\r\n" );
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document.write( "Case 2: AAB\r\n" );
document.write( "Choose the digit for A any of 2 ways {1,7}\r\n" );
document.write( "Choose the digit for B any of the remaining 5 ways.\r\n" );
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document.write( "Total for case 2: 2*5 = 10 ways. \r\n" );
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document.write( "Case 3: ABA\r\n" );
document.write( "Same as Case 2:\r\n" );
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document.write( "Total for Case 3: 10 ways.\r\n" );
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document.write( "Case 4: ABB\r\n" );
document.write( "Choose the digit for B any of 2 ways {1,7}\r\n" );
document.write( "Choose the digit for A any of the remaining 4 ways. (CAN'T choose 0)\r\n" );
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document.write( "Total for Case 4: 2*4 = 8.\r\n" );
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document.write( "Grand total: 100+10+10+8 = 128\r\n" );
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document.write( "Edwin\n" ); document.write( " \n" ); document.write( "