518. Coin Change II - LeetCode Python Solution

[@SHUBHAMJHA-o3g]

I cant thank you enough I was literally looking for someone to explain why we are using inclusion and exclusion!!!!!!! damn. I was using the initial intuition approach that you should was wrong and it was counting multiple times. And i was tryna use sets but that would be real inefficient. I still might have to understand it more, to really hit the spot but It was a really nice ice breaker. Basically I was thinking to prove how the code prevents {1,2,3} and {3,2,1} !