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987? It is just a guess of course.

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Q: What is the biggest 3 digit number with all the digits different?

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The biggest 4 digit number that can be made from using the digits of 850236, using a digit at most once, is 8653.

102 is the smallest three digit number with different digits.

smallest 8 digit number with three different digits

9,999,876 is the greatest seven-digit number using four different digits.

9876 is the largest four digit number you can make if all the digits must be different.

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.

The smallest two digit number is 00 (a number used as a wire gauge) and the biggest is 99, so the sum of the biggest and smallest 2-digits numbers is 99 (99 + 00).

> 9999876 Actually, 9999876 has four different digits (6, 7, 8, 9). The largest 7-digit number with three different digits is 9999987.

Any two digit number in which: (a) the units digit is not 0, and (b) the two digits are different will form a new 2-digit number when the digits are interchanged.

-4790281

Not necessarily. Consider 444. The digits are not different. The first and second digits are not multiples of 3 The first digit is not greater than the second digit. In spite of all that, 444 is a 3-digit number

The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.