A Level 1 book must introduce the idea that if you have $n+1$ objects to put into $n$ boxes, at least one box must contain two objects. It sounds obvious, but applying it to problems like "Prove that in a group of 13 people, at least two share a birth month" is the first step toward logical reasoning.
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Try adding "filetype:pdf" to your search, or terms like "sample pages" or "teacher’s guide" to find legitimate free excerpts. A Level 1 book must introduce the idea
The struggle is where the learning happens. mathematical olympiad training book level 1 pdf
The PDF version of the Mathematical Olympiad Training Book Level 1 is likely to include:
