Answer :
The intersection of two sets A and B is defined as the set composed by the elements appearing in both A and B.
So, the intersection is
[tex]A\cap B = \{5,11\}[/tex]
Because all the other numbers do not belong to both sets:
- 2, 3 and 7 belong to A alone
- 13, 15 and 17 belong to B alone
- 5 and 11 belong to both A and B