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This question already has an answer here:

I am using a Mac for the first time and need to install Eclipse. How do I know if I am on a 32 bit or 64 bit computer? I am on a MacBook Pro.

merged by nohillside Apr 24 '15 at 14:27

This question was merged with How to check whether my Intel-based Mac is 32-bit or 64-bit because it is an exact duplicate of that question.

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