Question

daca A={x/x apartine N , 10 pe x apartine N . Cardinalul lui A este?

Answer 1

A={1,2,5,10}
cardA=4
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Answer 2

$\frac{10}{x} \in N=\ \textgreater \ x\in D_{10}=\{1,2,5,10\}=\ \textgreater \ cardinal(A)=4$