Be consistent. If writing in paragraph form, if one is typed, then type twelve.
Or, 1 and 12.
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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.
The sum of the numbers from 1 through 100 is 5,050.
The sum of the numbers 1 through 27 is 378.
The sum of all the numbers 1 through 200 is 20,100.
There are 25 prime numbers from 1 through 100.