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| − | Prove that <math> \forall n\in{\mathbb N}, n^5-n < | + | Prove that <math> \forall n\in{\mathbb N}, n^5-n </math> is a multiple of n. |
Revision as of 15:34, 7 September 2008
Example: Prove that $ \forall n\in{\mathbb N}, n^5-n $ is a multiple of n.
