Find the smallest & greatest 4-digit number that can be formed by using the numbers 4,0,7, and 9.

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4079 & 9704

4079 & 9740

4097 & 9470

4079 & 9770

answer is B.

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Detailed Solution

To form the smallest number, arrange the numbers in ascending order.
To form the greatest number, arrange the numbers in descending order.
The smallest 4-digit number is “4079”.
The greatest 4-digit number is “9740”.

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