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A={X∈ D40 / X ≤ 15 }

Răspuns :

D₄₀={1,2,4,5,8,10,20,40} si pentru ca x≤15, multimea A={1,2,4,5,8,10}
D40= {1,2,4,5,8,10,20,40}
A={1,2,4,5,8,10}