[問題] 三項式分配的特殊性質分配
目前正在自修，在考試用書上看到三項式分配的一個特性
(X,Y)~Tri(n,p1,p2) ==> X+Y~B(n,p1+p2)
試圖想要用mgf的唯一性來推導 e^(tx+ty)*fxy
可能是功力不夠，掰不出結果
google了一陣子，仍覺得茫然
(KEYWORD: (三項式分配 OR trinomial distribution) X+Y)
想請教各位前輩該怎麼下手呢?
謝謝
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