Given the sets A = {-4, - 1, 3, 5, 9} and B = {-2, - 1, 0, 1, 2, 3}, the set AUB (u is upside down) is given by:

{-4, - 2, - 1, 0, 1, 2, 3, 5, 9}

{-4, - 2, - 1, - 1, 0, 1, 2, 3, 3}

{-1, 3}

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The upside down U is the symbol for the intersection of sets. The intersection of two sets is the set that contains the elements that are common to both sets. Which elements are both in set A and in set B?

Answer: {-1, 3}