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Question 7 from leaving cert higher level maths 2021 paper 1 is a sequences and series question based on the swing of a pendulum grandfather clock. In part a we find the first few terms of the sequence and then the 25th term t25. We then use the Sn sum to n formula followed by finding the first term that is less than a given value. In part b we use the arc length formula to find the size of an angle and then use the sum to infinity formula to find the total distance the pendulum travelled.