The consecutive angles of a particular trapezoid form an arithmetic sequence.  If the largest angle measures $120^{\circ}$, what is the measure of the smallest angle?
Question:
The consecutive angles of a particular trapezoid form an arithmetic sequence.  If the largest angle measures $120^{\circ}$, what is the measure of the smallest angle?
Answer:
Let's think step by step.

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60^\circ
The consecutive angles of a particular trapezoid form an arithmetic sequence.  If the largest angle measures $120^{\circ}$, what is the measure of the smallest angle?
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