On the general tab, you will have to give your rule details like Rule order, Rule priority, Rule description. After that choose the Discount method "Quantity based by product/category and BOGO deals".

 Step-2: Condition tab 

 After filling discount rule details, navigate to condition tab and define your discount conditions.

Step-3:  Discount tab

Now move to Discount tab and set the discount quantity range and select your discount product.

Step-4: Frontend  demo
 

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