[機率] 丟銅板贏家機率
可以請鄉民們，可以說明一下，為什麼答案是這樣嗎?
題目:甲、乙、丙輪流丟銅板，直到出現正面就是贏家，而銅板出現正面
的機率是k。假設乙第一回就獲勝了，試求乙贏的機率是多少?
答案是 P(乙贏)= (1-k)×k
(1-k)是代表甲輸的機率嗎? 為什麼是這2個相乘呢? 謝謝~
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