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aflati card B B={x € N*|x <_ 1957

Răspuns :

[tex]B=\left \{ x\:\in\:\mathbb{N^{*}} \:|\:x\leq 1957\right \}[/tex]

[tex]x \: \neq \: 0 \: = > cardB = 1957 - 1 + 1 = 1957[/tex]