North Dakota won the opener 4-2 on Friday.
Trupp's power-play goal at 12:54 of the second period snapped a 1-1 tie and the Fighting Sioux (6-1-1, 4-1-1 WCHA) added two goals in the final two minutes of the game, one by Trupp at 18:13 of the third.
David Toews had a goal and an assist and Brad Malone added two assists for UND. Jason Gregoire scored his fifth goal of the season to close out the scoring.
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Jordan Baker staked Michigan Tech (2-5-0, 1-4-0) to a 1-0 lead with a power-play goal at 8:07 of the first period. It was the only goal given up by UND goalie Brad Eidsness, who stopped 22 shots.
Kevin Genoe made 31 saves for the Huskies.
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