Question

Fie multimile A={3,7,11,15}si B={2,5,7,15,21}

A)AUB

B)AПB

Answer 1

A){3,7,11,15,2,5,21}
B){7,15}

Answer 2

a) scriem toate elementele din acele multimi
A∩B={2,3,5,7,11,15,21}

b) la intersesctie scriem doar elementele comune
=> A∪B={7,15}