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Could anyone have idea on this? There is a Gacha with n figures in total. Each time you open, the probability of getting each figure

Could anyone have idea on this?

There is a Gacha with n figures in total. Each time you open, the probability of getting each figure is exactly 1/n (so it is uniform). You are going to keep opening until you can collect all figures. What is the expected number of times you have to open?

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