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Q: What is the greatest possible 9 digit number without repeating any digit?

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9,876,543

The greatest possible number is 888... (repeating).

987

9876543

9876543

I believe it is: 987,654

I believe it is: 987,654

4321

10234567

Since we want our number to be as large as possible, we have to put the largest digits in the front, in the largest places so they have more value. Therefore, our answer would be 987,654,321.

The least possible integer is -98765432. The least possible positive integer is 10234567.

There are twelve possible solutions using the rule you stated.

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