Question

Determinati elementele multimii A={x€N|18|(x+1)}

Answer 1

Daca 18 |x+1 => x+1 ∈D18 
x+1 ∈ {1 ;2 ;3 ;6;9 ;18 } (-1)
x∈{0 ; 1 ; 2 ; 5 ; 8 ; 17 }