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Answer:
Smallest number: 5555789
Largest number: 9999875
Step-by-step explanation:
Since each digit must be used at least once, the smallest number that can be formed with the digits 5, 7, 8 and 9 is 5555789 (ascending order of digits with smallest digit used four times
The largest number is 9999875 (descending order of digits with largest digit used four times)