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Q: Using four different digits what is the least sum you can get when you add two digit numbers?

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You can select 9 numbers for the first digit, 8 numbers for the second digit, and 7numbers for the third digit; so 504 (e.g. 9*8*7) different three digit numbers can be written using the digits 1 through 9.

You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

24 different numbers.

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

6 possible 3 digit combonations

If you want 4-digit numbers, there are 24 of them.

The number of six digit numbers that you can make from ten different digits ifrepetitions of same digit on the six digit number is allowed is 1 000 000 numbers(including number 000 000).If no repetitions of the the same digit are allowed then you have:10P6 = 10!/(10-6)! = 151 200 different six digit numbers(six digit permutations form 10 different digits).

5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.

There are 60480 numbers.

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