Aribo picked up Borna Barisic throw-in midway inside the United half, he beat Calum Butcher, played a lovely one-two with Alfredo Morelos to take him into the area, jinked inside Ryan Edwards and unleashed a screaming drive into the top corner.
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The 24-year-old has now scored six goals in 23 league appearances for the Gers this season.
The midfielder and his international teammate Leon Balogun were in action for 90 minutes in the game.
Ianis Hagi, Ryan Kent and Morelos scored the other goal for Rangers.