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【數學題】拋擲硬幣中正面的數目的期望值 難度: ⭐️⭐️⭐️Sawa keeps tossing an unbiased coin until she gets a tail. Find the expected number of head that shegets at the end.紗和不斷拋擲一枚沒有偏差的硬幣，直至她得到一個反面。求她最終所得正面數目的期望值。─────────Follow我哋FB/IG..