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Question:

Let X and Y be the following sets:
X={2,8,10,11,13,16,17}
Y={1,5,7,11,13}
Which of the following is the set X∩Y?

A {11,13}
Explaination

The ∪ symbol means union. The union of two sets includes all the values that are in either (or both) of the sets.
The ∩ symbol means intersection. The intersection of a set includes only the numbers that are in both sets. Only two numbers are present in both sets X and Y:
{11,13}