To determine which model shows the relationship where "for each square there are 3 circles," we can analyze the options provided:
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3 squares and 2 circles: This does not fit the relationship since the ratio of squares to circles is not maintained.
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2 squares and 6 circles: This works, as for each square (2 squares), there are 3 circles (6 circles total).
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6 squares and 2 circles: This does not fit the relationship since there are far fewer circles than the squares.
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2 squares and 3 circles: This does not match the relationship, as there are only 1.5 circles per square.
Based on the evaluations, the model that shows the relationship of "for each square there are 3 circles" is 2 squares and 6 circles.