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Very tough problems.

Check my set Hard.It contains quite tough problems.Some of them are not yet solved.I will like you to try those.If there's something in the problems that confuses you, please let me know.

Note by Souryajit Roy
2 years, 5 months ago

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The combinatorics questions in this set are really interesting. Thanks for sharing! :) Lee Gao · 2 years, 5 months ago

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@Lee Gao Congrats,you are the first one to solve those really tough combinatorics problems.. Souryajit Roy · 2 years, 5 months ago

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