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Card A=5
Card B=8
Card (AuB)=10
Card (A intersectat cu B)=?


Răspuns :

se aplica formyula
card ( AUB) =card A + card B -card ( A∩B)
in cazul nostru, inlocuind cu valorile date , avem:
10=5+8-card ( A∩B)
10=13-card ( A∩B)
card ( A∩B)=13-10=3, cerinta