Health insurer UnitedHealth Group on Wednesday agreed to buy Change Healthcare for $7.84 billion in an all-cash deal, as it looks to expand its fast-growing healthcare technology business. UnitedHealth will pay $25.75 per Change Healthcare share, a premium of 41.2 percent to Tuesday’s closing price. Shares of Change, which will merge with UnitedHealth unit Optum, were trading near the offer…

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