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Question Number 133535 by mathmax by abdo last updated on 22/Feb/21
find the sequence u_n wich verify  u_n +u_(n+1) =(((āˆ’1)^n )/n^2 ) āˆ€nā‰„1
$$\mathrm{find}\:\mathrm{the}\:\mathrm{sequence}\:\mathrm{u}_{\mathrm{n}} \mathrm{wich}\:\mathrm{verify}\:\:\mathrm{u}_{\mathrm{n}} +\mathrm{u}_{\mathrm{n}+\mathrm{1}} =\frac{\left(āˆ’\mathrm{1}\right)^{\mathrm{n}} }{\mathrm{n}^{\mathrm{2}} }\:\forall\mathrm{n}\geqslant\mathrm{1} \\ $$

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