[作業] 請問機率作業

[gkk886 (案 買瓦斯去氣爆)]

前2次是分別是哪幾題阿

改回來發現自己寫錯題

囧rz

--
A temporary catatonic
Madman on occasion

When will he break out
Of his solitary shell
                      ~~Dream Theater~~ Solitary Shell

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