If you haven’t seen them yet, the new problems for IYPT 2011 (which will be held in Tehran, Iran) are already available.
http://iypt.at/en/home/problems2011/
Blog about the IYPT2010
If you haven’t seen them yet, the new problems for IYPT 2011 (which will be held in Tehran, Iran) are already available.
http://iypt.at/en/home/problems2011/
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