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Q: How many combinations are there for a 6 digit number using the numbers 0 to 9?

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Number of 7 digit combinations out of the 10 one-digit numbers = 120.

There are 840 4-digit combinations without repeating any digit in the combinations.

It depends. If you can only use each number once, there are 720 combinations. If you can use numbers multiple times, then there are 1000 combinations, by using all numbers from 000 to 999.

Using the formula n!/r!(n-r)! where n is the number of possible numbers and r is the number of numbers chosen, there are 13983816 combinations of six numbers between 1 and 49 inclusive.

120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.

There are 360 of them.

If there are no restrictions on duplicated numbers or other patterns of numbers then there are 10 ways of selecting the first digit and also 10 ways of selecting the second digit. The number of combinations is therefore 10 x 10 = 100.

the answer is = first 2-digit number by using 48= 28,82 and in 3 digit is=282,228,822,822

How many numbers are there between 0000 and 9999?

There are twelve possible solutions using the rule you stated.

1,000,000. Specifically, they are all numbers from 000000-999999

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