0 votes 0 votes From a given tautology, another tautology can be derived by interchanging. A). 0 and 1 B) And and OR C) 0 and 1; And and OR D) Impossible to derive Sanjay Sharma asked Jul 20, 2018 Sanjay Sharma 1.3k views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply Shaik Masthan commented Jul 20, 2018 reply Follow Share what i think tautology means for every combination of values, it's output is true by changing 0 to 1, and 1 to 0, all rows are preserved, it's output also preserved ===> Tautology derived 0 votes 0 votes Sanjay Sharma commented Jul 20, 2018 reply Follow Share p +1 is tautology but p.0 is not 0 votes 0 votes Shaik Masthan commented Jul 20, 2018 reply Follow Share yes i missed that... duplicate of https://gateoverflow.in/219762/gate_2019_mock_paper 0 votes 0 votes Please log in or register to add a comment.