-10 belongs to the set of all integers denoted by Z.
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Natural numbers.
1.18 is a number and number do not contain any sets (of any kind).
173 belongs to the set of positive natural numbers and it also belongs to the set of prime numbers.
There are approx 5.709*10^45 possible sets of numbers that can be made out of the composite numbers in 1 and 200.
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.