The USABO Open past papers are freely available online.
These solutions contain valuable insight on how to approach difficult questions. They will walk you through the most efficient methods which can help you rapidly get the correct answer. Filled with examples of time saving techniques and score boosting strategies, this is a MUST-BUY for anyone using past papers as part of their USABO preparation.
(The original papers are not included)
*Note that PDF files are nonrefundable.
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