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1. 
Prime numbers
2. 
even numbers from 20
3. 
Triangular numbers
4. 
Multiples of 10
5. 
Multiples of 6
6. 
Select the factors of 12
A.
6
B.
2
C.
3
D.
5
7. 
Select the natural numbers
A.
4
B.
27
C.
-5