[閒聊] 三倍掉落率
對於三倍掉落率有一點想法。
就是常常會有人覺得跟同一關打三次是一樣的機率，
但是如果我們假設掉落率是x for 1 >= x >= 0
三倍掉落率的拿棋機率是: 3x ...(a)
同一關打三次的拿棋機率是:
x + (1-x)x + (1-x)^2 * x
= 3x - 3x^2 + x^3 ...(b)
在 1 >= x >= 0的區間內 (a)是恆大於(b)的，
更不用提體力cost三倍這件事，
所以總而言之，
這五天似乎都不應該打鳥關拿來打想要的棋寵才對。
順便讓我炫耀一下昨天打到的光獅XD
http://ppt.cc/XS67
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