[數撚圍爐區] Loop-Suspension Adjunction (55)

我又番嚟問問題了

是咁的

Part(b)
唔知點解做到咁撚奇怪

唔知是咪一開波已經錯咗？

呢張先啱
但都係計唔到
卡關了

有無神人可以解答下我呢條題目點解個答案係34，而我計到6/81=29

since both bags are identical, the problem can be transformed to asking whether the ball taken out have the same in mod 4:
so the chance is
sum (P(getting k mod 4))^2 = 3*(2/9)^2 + (3/9)^2 = 21/81 = 7/27

我估你漏咗0都係4嘅倍數，同埋兩個袋係一樣啊。分子係9+6+6。

明白哂 我唔係讀數，純粹係個得中學concept，得閒諗下啲題目既人，唔該哂

5該哂

最頂嗰個係咪你個名？