Sales of Massachusetts single-family homes and condos rose by more than 50 percent in November when compared to the same month a year ago, and prices also showed some improvement, said the Warren Group, a Boston firm that tracks local real estate activity.

A year-ago, the country was in the midst of a financial crisis that hurt home sales. As a result, November 2009 benefitted from some easy comparisons to November 2008, said the Warren Group, which added that a home buyer tax credit also helped last month’s sales.

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