Thalys train ticket from Armsterdam Central to Gare de Nord Paris


I plan to travel Europe in a week through a coach from Paris, France to Armsterdam. On the last day of my tour, I plan to go back to Paris by taking a Thalys train to catch my flight the next day. Is train pass necessary since I'll not traveling within Paris anymore? Or a train ticket is enough to travel from Armsterdam to Paris? Please clarify.
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