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There is no way to know for sure. Roughly 245 Billion Hamburgers served as of March 31st 2010. I use the history of the number McDonald's used to put on their sign and a complex calculation involving monthly and yearly sales data put out by McDonald's.
over 247 billion

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โˆ™ 2014-07-02 13:29:53
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Q: How many McDonald's hamburgers have been served?
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