問題詳情
20.妙麗用魔法將石頭變成金幣，第1個石頭變成1顆金幣，第2個石頭變成5顆金幣，第3個石頭變成9顆金幣，第4個石頭變成13顆金幣，以此類推，已知最後變出780顆金幣，請問她總共變了幾個石頭？
(A)17
(B)18
(C)19
(D)20
(A)17
(B)18
(C)19
(D)20
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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