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Question

If n is a natural number, then (6n2 + 6n) is always divisible by:

Options:
A .  6 only
B .  6 and 12 both
C .  12 only
D .  by 18 only
Answer: Option B

(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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