Discrete Looking for a basic Combinatorics text

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The discussion centers on the frustration of needing to prepare for a university access exam that includes a combinatorics problem, despite the topic not being covered in the course. The individual expresses a desire for a more efficient way to learn combinatorics, emphasizing the lack of time to delve deeply into the subject. They seek light reading materials that provide definitions and interesting problems rather than in-depth treatments with proofs. The focus is on finding accessible resources that can help them grasp the basics of combinatorics quickly, allowing them to balance their studies in other subjects like Maths, Physics, and Chemistry.
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I need to know this subject for my uni access exam, which will include one combinatorics problem.

It's very silly because it's not studied in the course at all, you are instead given random problems and are supposed to magically know them and work them out in the most painful ways. I just don't have the physical time to waste it inventing formulas for how many lads shake hands (I wish I did because it's an interesting field)

It's going to be something I'll read on my 'free' time after I've done my Maths, Physics and Chemistry work so it has to be as light of a read as possible. I'm not looking for a deep treatment with proofs. Definitions here and there and interesting problems is all I need.
 
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