hard · GMAT Quant
If n is any integer, which of the following statements regarding n^3 - n must be true?
- n^3 - n is always odd.
- n^3 - n is divisible by 6 for all integers n.
- n^3 - n is divisible by 12 for all integers n.
- n^3 - n > 0 for all integers n.
- n^3 - n is prime for at least one integer n.
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