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question regarding test code coverage?

Do I need to have the code coverage of all my classes to more than 75% or is it just that I need for the entire application(when i do run all tests!!).
You need to have at least 75% code coverage for the apex classes and triggers that you are deploying into Production.
For example, if you have 2 apex classes in Production org already, then you want to deploy 2 more apex classes into production, during the deployment process, you need to have at least 75% code coverage across all 4 apex classes.