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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.
No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
89,999 different numbers i guess
6 possible 3 digit combonations