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Q: How many 9 digit combinations are there for numbers 0 through 9?

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There are 38760 combinations.

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

Exactly 3,628,800, or 10!.

The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.

15

10,000

2304

It is: 9C7 = 36

66

There are 1140 five digit combinations between numbers 1 and 20.

10!/3! = 604800 different combinations.

that would be 9 to the 7th power i believe.

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