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Let-f-N-N-a-bijection-Prove-that-k-1-n-f-k-1-2-3-n-

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Question Number 128105 by snipers237 last updated on 04/Jan/21
Let f N^∗ →N^∗ a bijection Prove that Σ_(k=1) ^n f(k)≥1+2+3+...+n
LetfN∗→N∗abijectionProvethat∑nk=1f(k)⩾1+2+3+…+n

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