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Let X and Y be the following sets:
Which of the following is the set X∩Y?

A {11,13}

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:

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