1003055705

SubArea: 
Logic and sets
Level: 
A
Project ID: 
1003055705
Source Problem: 
1003055706
Accepted: 
1
Clonable: 
1
Easy: 
1
Given the sets \begin{gather*} A = \{1; 2; 3; 4; 5; 6; 7; 8; 9\},\\ B = \{3; 4; 5; 6; 7\},\\ C = \{6; 7; 8; 9; 10; 11; 12\}, \end{gather*} find the union \( A\cup B\cup C \).
\( \{1; 2; 3; 4; 5; 6; 7; 8; 9;10; 11; 12\} \)
\( \{1; 2; 3; 4; 5; 6; 7; 8; 9\} \)
\( \{6; 7\} \)
\( \{1; 2; 10; 11; 12\} \)