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.

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TopNewestThe combinatorics questions in this set are really interesting. Thanks for sharing! :) – Lee Gao · 1 year, 10 months ago

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– Souryajit Roy · 1 year, 10 months ago

Congrats,you are the first one to solve those really tough combinatorics problems..Log in to reply