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1. There are 6! = 720 ways in which 2 Argentinians, 2 Bolivians, and 2 Colombians...

1. There are 6! = 720 ways in which 2 Argentinians, 2 Bolivians, and 2 Colombians can stand in a straight line. How many of these ways will have the property that that no two persons from the same country are standing next to each other?

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