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102 is the smallest three digit number with different digits.

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102

Q: What is the smallest three-digit number with all the digits different?

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smallest 8 digit number with three different digits

999999

102

102.

1023

102,345

12345

Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.

100,002.

10002

It is 1,000,002

555