Hints:
- Note for example $n^3-3n+2 = (n-1)(n^2-n-2) = (n-1)(n+1)(n-2)$. You can factorise completely to a product of terms like $(n-1)$ and $(n+2)$. Do that
- How many powers of $5$ must the product have?
- How many powers of $3$? How many powers of $2$?
Henry
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