Video at the private university captured the students learning that their tuition will be free this year.
Any senior who already paid will receive a refund.
The decision comes as the college tries to bring back free tuition for all students.
About 10 years ago, Cooper Union had a financial crisis and began charging students to attend.
Since then, New York's Attorney General Letitia James came up with a plan that helped the school meet its financial goals.
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