Exercise condition:

5
1. Use the digits 4, 7, 1 to form the three-digit number.
 
The greatest three digit number formed \(=\) .
 
The smallest three digit number formed \(=\) .
 
 
2. Use the digits 7, 1, 4 to form four-digit number by taking any one digit twice.
 
The greatest four digit number formed \(=\) .
 
The smallest four digit number formed \(=\) .
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