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If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .

If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .

If the same digit can't be used more than once, then the largest possible number has only

10 digits. The number is 9,876,543,210 .

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14y ago
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14y ago

Use the highest possible digit (9) for all 12 digits.

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Q: The largest 12- digit number where repeated digits are allowed?
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