The correct sentence is If I hadn’t gone on vacation to Washington, I wouldn’t have met Sam. It is a third conditional sentence. It refers to a situation that happened in the past. It means that the person went on vacation and met Sam
The answer is: if I hadn't gone on vacation to Washington, I wouldn’t have met Sam.
The conditionals have different forms, in this case if we are using perfect conditional or perfect continuous conditional for the main clause or result is mandatory to use If plus past perfect in the if clause or conditional, this mean s, that the correct sentence should be “If + had” and “would”.
Well for example if you had a cow girl in new york that wouldn´t work unless she is new to the city...if you had a famous person in the 1600´s she would not be dressed like katy perry or kim exc.
