Q: Using four different digits what is the least sum you can get when you add two 2 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.

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

24 different numbers.

6 possible 3 digit combonations

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

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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.

2222

24 different numbers.

There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.

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).

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

6 possible 3 digit combonations

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

18

6 2-digit numbers (13/15/35/53/51/31)