Question: When did the ipad pro 12.9 come out?
Disambiguated questions and answers: question: When did the 1st Generation 12.9-inch iPad Pro come out?
When did the 2nd Generation 12.9-inch iPad Pro come out?
When did the 3rd Generation 12.9-inch iPad Pro come out?
answer: November 11, 2015
June 13, 2017
November 7, 2018
Natural Questions answer: on November 11 (from the Wikipedia article "iPad Pro")