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Yes. Statement 1 alone is sufficient taking m(m^2+2) and since m is positive integer, you can take m = 1,2,3 and so on for any such value of m, this equation m(m^2+2) will always be a multiple of 3. Since its a multiple of 3 and is a factor of n, thus n will be a multiple of 3 or in other words n will be divisible b 3.

Statement 2 is not sufficient taking m^2(m+2) and since m is positive integer, you can take m = 1,2,3 and so on for any such value of m, this equation m^2(m+2), seems to be a multiple of 3 in some cases and not a multiple in some cases. So based on this alone we cannot guess if n is divisible by 3 or not.