Being n the number of points (If n = 3 there would be 3 points: A, B and C). The distance between each pair of points increases progressively twice, starting with points A and B.

Given n as an integer greater than 1 and x as the distance between the last pair of points (D and E in figure).

Find the distance between the first and last points y.

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Riccardo G. CXD 董济川 Lorenzo

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