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Question Number 34595 by abdo mathsup 649 cc last updated on 08/May/18
simplify Σ_(k=1) ^n (((−1)^(k−1) )/k) C_n ^k
$${simplify}\:\:\sum_{{k}=\mathrm{1}} ^{{n}} \:\:\frac{\left(−\mathrm{1}\right)^{{k}−\mathrm{1}} }{{k}}\:{C}_{{n}} ^{{k}} \\ $$

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