Question

Aflati cardinanul multimii B

Answer 1

card B = 1957-1 =1956. (ptr ca nu il contine pe 0)

Answer 2

$\it B=\{x\in \mathbb{N}^*\Big{|}x\leq 1957\} \Rightarrow B=\{1,\ 2,\ 3,\ ... ,\ 1957\} \Rightarrow card(B) = 1957$