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36 of them.

Q: How may different 4 digit numbers can be made from the digits 1 2 3 and you have to use each number at least once?

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12689 14689 12489

Among whole numbers, 1,023,456 is.

smallest 8 digit number with three different digits

73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

The sum is 22 times the sum of the three digits.

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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).

12689 14689 12489

Among whole numbers, 1,023,456 is.

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

36

102 is the smallest three digit number with different digits.

smallest 8 digit number with three different digits

73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

The sum is 22 times the sum of the three digits.

In the numbers 1-9 each number has 1 digit and there are 9 of them, so that's 9.In 10-99 each number has 2 digits, and there are 90 of them: 2x90 = 180There are 900 three digit numbers [100 through 999]: 2700 digits.There are 9000 four digit numbers: 36000 digits.90,000 numbers with five digits: 450,000 digits.900,000 numbers with six digits: 5,400,000 digits.Then 1 number with seven digits: 7 digits.Add them up and you have 5,888,896 digits.

Any number that has 4 or 5 digits. A digit in a number is one number place. 1 has 1 digit, 11 has 2 digits, 111 has 3 digits, and so on.

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.