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Smallest number would be 123.

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Total of all the numbers is 504.

The average is 126.

504 ÷ 126 = 4

So there are 4 cards with three-digit odd numbers.

The difference between the smallest and largest number is 6.

Since the average is 126, and the difference is 6, the largest number must be 3 above 126, i.e. 129.

The smallest must be 3 below 126, so 123.

The numbers are 123, 125, 127, 129.

 

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