Bjørgen raced with Ingvild Flugstad Østberg in the relay, where teams of two women each perform three alternate sprints.
In a clean sweep for the nordic nations, Norway finished in 16 min 4.05sec, with Finland 9.09sec behind for silver. Sweden took the bronze in 16min 23.82sec.
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Bjørgen had already won the skiathlon at Sochi 2014 to go with her three golds from Vancouver 2010.