Given the following sets, A={5, 6, 7, 8, 9}, B={a, b, 5, 6, 7, 11}
Find: A∩B
Make sure to enter your answer as a set, using { }. As you enter your answer, separate the elements in the set with a comma, as in {1, 2, 3} (Note the space between the comma next element in the set).
If you need to enter the empty set, either write "empty set" or write { }