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calculate-n-1-1-n-1-n-n-1-3-m-n-




Question Number 161176 by mnjuly1970 last updated on 13/Dec/21
        calculate              Θ := Σ_(n=1) ^∞ (( (−1 )^( n−1) )/(n ( n + (1/3) ))) =?            ■  m.n         −−−−−−−−−−−−−
$$ \\ $$$$\:\:\:\:\:\:{calculate}\: \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\:\:\Theta\::=\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{\:\left(−\mathrm{1}\:\right)^{\:{n}−\mathrm{1}} }{{n}\:\left(\:{n}\:+\:\frac{\mathrm{1}}{\mathrm{3}}\:\right)}\:=?\:\:\:\:\:\:\:\:\:\:\:\:\blacksquare\:\:{m}.{n} \\ $$$$\:\:\:\:\:\:\:−−−−−−−−−−−−− \\ $$$$ \\ $$

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