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Aflati cardinalul multimii A={× € N | x divide pe 15


Răspuns :

A={x∈N I x I 15}
x I 15
x∈D15
x∈{1,3,5,15}
A={1,3,5,15}
card(A)=4
[tex]A=D_{15}[/tex]
[tex]D_{15}=\{1,3,5,15\}[/tex]
[tex]A=\{1,3,5,15\}[/tex]
[tex]cardA=4[/tex]