Both Harry and Cornfalakes are right. Intuitevely Cornflakes calculates it using idea that our probability to get good leader is 1 minus probability of getting bad leader on both picks. Old harry instead calculates first the chance of getting good leader on first draw and then ads probability of getting good leader on the second draw, here he however calculates twice the situations in which both first and second picks are good leaders and thus has to subtract the probability of those situations.
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[Spoilers] Shallow Old Human Tourist Hit the beach!
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