December 2018 1 316 Report

Fie X={1,3,5,7,...,(2k+1)...} . Construim urmatorul sir de submultimi ale lui X: A₁ = {1} ; A₂ = {3,5} ; A₃ = {7,9,11} s.a.m.d.
a) Scrieti submultimile A₄ si A₅ .
Calculati suma elementelor submultimii A₂₀ .

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