Q: Who made numbers 1 through 9?

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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.

9

10

Each digit can appear in each of the 4 positions. There are 9 digits, therefore there are 9⁴ = 6561 such combinations.

ten

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It is: 9C7 = 36

999-111=888 888 3 digit numbers can be made with numbers between 1 - 9

If you mean how many different sets of 7 can be made from 9 numbers, the answer is (9 x 8)/2 ie 36.

10

it is 9 because other numbers are made up by the same numbers already used 1-9 for example

1 - 1 2 - 4 3 - 9 4 - 16 5 - 25 6 - 36 7 - 49 8 - 64 9 - 81

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.

3,5,7,8

900000

9

10

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