A.  6 only

B.  12 only

C.  6 and 12 both

D.  by 18 only

1
Correct Answer :
6 and 12 both
Explanation :

(6n2 + 6n) = 6n(n + 1), which is always divisible by 6 and 12 both, since n(n + 1) is always even.


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