Question

Everyone of theses is a factor of 1989 except:

Answer 1

The answer is c, because 1989/11 isnt a whole number

[answers]

a.) 1989/3=663
b.) 1989/9=221
c.) 1989/11=180.82 *right answer
d.) 1989/221=9

Answer 2

1,3,9,13,17,39,51,117,153,221,663, and 1989 are factors of 1989. 

C) 11 is not one of them.