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Using the digits 7, 4, 9 and 0 without repetition, the smallest 4-digit number is [[1]].

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Detailed Solution

0479 and 0749 are not 4-digit numbers, these are 3-digit numbers.

The smallest number is formed by following the reverse procedure.

(a) The greatest digit is placed at one's place.

(b) The next smaller digit at ten’s place and so on till all the given digits are finished.

Thousands Hundreds Tens Ones

4 0 7 9

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