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Question Number 21377 by Tinkutara last updated on 22/Sep/17

$$\mathrm{Balls}\mathrm{are}\mathrm{dropped}\mathrm{from}\mathrm{the}\mathrm{roof}\mathrm{of}\mathrm{a}$$$$\mathrm{tower}\mathrm{at}\mathrm{a}\mathrm{fixed}\mathrm{interval}\mathrm{of}\mathrm{time}.\mathrm{At}\mathrm{the}$$$$\mathrm{moment}\mathrm{when}9\mathrm{th}\mathrm{ball}\mathrm{reaches}\mathrm{the}$$$$\mathrm{ground}\mathrm{the}n\mathrm{th}\mathrm{ball}\mathrm{is}\left(3/4\right)\mathrm{th}\mathrm{height}$$$$\mathrm{of}\mathrm{the}\mathrm{tower}.\mathrm{What}\mathrm{is}\mathrm{the}\mathrm{value}\mathrm{of}n?$$

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