Question: Let's say that a set S 1 has 6 0 elements and that S 2 has 7 0 elements. There are also 2 0 elements

Let's say that a set S1 has 60 elements and that S2 has 70 elements. There are also 20 elements common to S1 and S2. How many elements are in the union of the sets S1 and S2?

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