Question
Make the greatest and the smallest 4-digit numbers using the digits 5, 4, 7, and 9 (without repeating the digits) and with the condition that 7 is at the unit’s place.

Answer

7 is a unit’s place
The smallest 4-digit number using the digits 5, 4, 7 and 9, and keeping 7 at unit’s place = 4597
The greatest 4-digit number using the digits 5, 4, 7 and 9 and keeping 7 at unit’s place = 9547

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