[問題] 106數學
就問一下今天吃飯那題
題目應該是每個都要吃到
兩種飯麵 吃五天
不能麵同時吃兩天
我自己解是這樣
應該只有兩種情況
1.三飯兩麵
2.三麵兩飯
三麵兩飯比較單純
麵飯麵飯麵
方法數 = (2^3-2)*2 = 12
三飯兩麵
O飯0飯0飯0
方法數 = (2^3-2)*(4個空位取兩個做排列) = 12 * 6 = 72
72+12 = 84
這樣有錯嗎?還是
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