Buyers snapped up more than 4,000 single-family homes in Massachusetts last month, pushing the number of statewide sales for first 10 months of 2012 above the total for all of last year. Warren Group, a Boston-based real estate tracking company, reported Tuesday that home sales in October increased by 21 percent -- to 4,044 -- compared with the same period last year, reflecting increased optimism about the local housing market. Sales between January and October rose to 39,491, a 22 percent increase compared with those months in 2011.
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