Trish's faulty reasoning is due to hasty generalization based on limited visits to the ice cream parlor.
Hasty generalization is the type of faulty reasoning demonstrated by Trish. This occurs when a conclusion is drawn from insufficient or biased evidence. In this case, Trish's belief that the ice cream parlor has the best customer service in the city is based on a small number of visits, which is not enough to make a reliable judgment.
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