Discount based on Product Quantity in Cart

I am trying to figure out a way to put a discount on items if they have a certain quantity of said item in cart.

For example: if item A has qty 1 in cart, item B has qty 2 in cart and item C has quantity 3 in cart, items B&C would get the discount but not item A

What is the best way to go about this?

submitted by /u/sparkyboom4
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