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Using the dig...

Question

Using the digits 1,2,5,9 exactly once in each number, what is the difference between the largest and the smallest 4-digit number that can be formed?

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Solution

Largest number formed by 1,2,5,and 9=9521
Smallest number formed by 1,2,5 and 9=1259
Difference $= 9521 - 1259 = 8262$

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