Question

Daca A={x ∈ N | -1 ≤ x/2 ≤ 7/3} , atunci card A=..........

Answer 1

Daca A={x ∈ N | -1 ≤ x/2 ≤ 7/3}
A={x ∈ N | -2 ≤ x ≤ 14/3}
A={x ∈ N | -2 ≤ x ≤ 4,(6)}
A={-2,-1,0,1,2,3,4}, insa x∈N, unde N= multimea numerelor naturale {1,2,3,...}, prin urmare A={1,2,3,4}
, atunci card A=4