SAN FRANCISCO – Shares of Apple Inc. fell lower Tuesday as the company event in which the tech giant unveiled its new iPad Air wrapped up. Apple was last trading down nearly 2% to $512.80, after a brief rally when the new tablet was introduced. The stock had been in the red leading up to the event. Apple also unveiled a new Mac Pro computer and said the new version of its operating system, OS Mavericks, will be available for free.
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