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9. Safa is a resident of UAE where mobile numbers consist of 7 digits. She tells her friend that her mother's mobile number is the smallest number and father's is the greatest number that can be formed by using the digits 5,7,9,8. Help her friend to find her parents numbers. Each digit must be used at least once. ​

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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)

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