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At least two people have the same birthday in a school of 150 students

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?