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Question Number 84571 by msup trace by abdo last updated on 14/Mar/20
calculate S_n =Σ_(k=1) ^n (((−1)^k )/( (√k)))
$${calculate}\:{S}_{{n}} =\sum_{{k}=\mathrm{1}} ^{{n}} \:\frac{\left(−\mathrm{1}\right)^{{k}} }{\:\sqrt{{k}}} \\ $$

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