i got you buddy!
52p1 because your choosing 1 card from a deck first and order matters so the formula for that would be 52!/52-1! which is just 51.
so you take 51 and multiply that by 3p1 because you've already chosen one card, and theres 4 of each card, so 3 left, and your choosing one more. so it should be 3!/3-1! which is just 2! which is just 2. so i think its just 51x2, but im not positive whether or not you use permutations or combinations. but if i remember right, since your only chosing one card at a time, it doesnt matter.
hope that helps
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