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Count of Last 3 Months Unbilled outlets exclude the current Month

I have a column named "flag" in which "1" is against billed outlets and "0" is against unbilled outlets. I want to calculate the count of outlets that are unbilled from last 3 Months and exclude the current month. 

In full data: year_month range  is January 2018 to Decemeber 2020. 


In Sample data provided for help: year_month range is 2020.


Attached sample data image. Please guide me in using the DAX expression. 

Sample data Image.png

Super User
Super User

Please provide sample data in usable format (not as a picture) , show the expected outcome, and give sufficient context.

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