1,2,3,4,6,12
I'm pretty sure the answer would be 1,2,4,16 (:
We can't answer this accurately if you don't tell us the groups to choose from.
13 and 19 aren't composite. 1,2,5,10 1,13 1,2,3,6,9,18 1,19
1,2,3,4,6,12 names all the whole number factors of the composite number 12.
the set of factors
As a product of its prime factors: 2*3*3*5*139 = 12510 or as 2*32*5*139 = 12510
One and the number itself.
Any prime number only has two factors, one and the number itself.
1 and 71
1,3,9,27
1,2,4,5,10,20