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Question

What is the sum of the largest 7-digit number and smallest 6-digit number when all the digits are different?

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Solution

The digits we can use are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

The largest 7-digit number when all digits are different is 9876543

The smallest 6-digit number when all the digits are different is 102345

We need to find the sum of 9876543 and 102345

9876543 + 102345 = 99,78,888

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