【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 she
gets 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。




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