![](https://i.imgur.com/sj4MDGo.jpg)
[機統] 關於卜瓦松分配的條件機率 求救
![](https://i.imgur.com/sj4MDGo.jpg)
想詢問用鉛筆圈起來的地方,為什麼要改寫成X3+X4+X5=3,而不是整個Y等於6呢 謝謝
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