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 Jul 25 awarded Popular Question Mar 4 awarded Popular Question Jan 3 revised Does complementary relation($\overline R$) is transitive? edited title Jan 3 comment Does complementary relation($\overline R$) is transitive? Sorry,I edited body of question. Jan 3 comment Does complementary relation($\overline R$) is transitive? Sorry.I think new question is correct. Jan 3 revised Does complementary relation($\overline R$) is transitive? deleted 6 characters in body Jan 3 revised Does complementary relation($\overline R$) is transitive? added 36 characters in body Jan 3 asked Does complementary relation($\overline R$) is transitive? Dec 16 revised Problem about combinatorics deleted 53 characters in body Dec 15 revised Problem about combinatorics edited body Dec 15 awarded Commentator Dec 15 comment Problem about combinatorics @I edited my answer , does new answer is true? Dec 15 revised Problem about combinatorics added 53 characters in body Dec 15 revised Problem about combinatorics edited body Dec 15 comment Problem about combinatorics Do you consider set of four ? we shouldn't use pairs ca AND cc in cases.can you explain more? Thanks. Dec 15 revised Problem about combinatorics edited body Dec 15 asked Problem about combinatorics Nov 30 awarded Supporter Nov 30 comment Two problem number-theory complete and useful for me. Nov 30 accepted Two problem number-theory