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	Các bình luận về: Đề bài: Chứng minh rằng: $C^{0}_{n}+C^{1}_{n}.n+C^{2}_{n}.n^{2}+&#8230;+C^{n}_{n}.n^{n}\geq 2^{n}.n!$ với $\forall n \in Z,n\geq 2$	</title>
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