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 4 is at a hundred’s place.

Answer

4 is at hundred’s place
The smallest 4-digit number using the digits 5, 4, 7 and 9 and keeping 4 at hundred’s place = 5479
The greatest 4-digit number using the digits 5, 4, 7 and 9 and keeping 4 at hundred’s place = 9475

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