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there are 5 diffeerent sets Natural Numbers whole numbers integers rational numbers irrational numbers.
6 if order doesn't matter
You can select 12 numbers for the first digit, 11 numbers for the second digit, and 10 numbers for the third digit; so 12*11*10 = 1320 sets of 3 numbers can be made out of 12 different numbers.
The theory of numbers is based on the property of sets of different kinds of numbers.
the answer is -1