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The Group of 20 is an organization consisting of Finance Ministers and Central Bank Governors (G-20, G20, Group of Twenty) from 20 economies: 19 countries plus the European Union, which is represented by the President of the European Union and by the European. en.wikipedia.org/wiki/Group_of_20
Union.
The answer depends on whether you mean A intersecting (B union C) or (A intersecting B) union C.
Given two or more sets there is a set which is their union and a set which is there intersection. But, there is no such thing as a "union intersection set", as required for the answer to the question.
Tennessee was the 16th state to join the union.