ARUNACHAL PRADESH Chief minister Prem Khandu Thungon Chief minister 1975-79 Tomo Riba 1937-2000 Chief minister 1979 Gegong Apang 1945 Chief minister 1980-99 Mukut Mithi 1954 Chief minister 1999-2003 Gegong Apang 1947 Chief minister 2003-07 Dorjee Khandu 1955 Chief minister 2007-