問題詳情
60. 阿發想買藍色與黑色兩種鋼筆，如果兩種鋼筆總共至多買 15 枝，而且藍色鋼筆的數目不超過黑色鋼筆數目的 2 倍，又藍色鋼筆最少買 6 枝、黑色鋼筆最少買 4 枝，有幾種可能的買法？
(A) 6 種
(B) 9 種
(C) 12 種
(D) 18 種
(A) 6 種
(B) 9 種
(C) 12 種
(D) 18 種
參考答案
答案：D
難度：適中0.577093
統計：A(52),B(19),C(25),D(131),E(0)
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