問題詳情
27. 一數列｛an｝ 的前 n 項和 Sn=3n2+2n-5，而一般項以an 表示，則下列何者正確？
(A) an=6n-1
(B)a1 = 5
(C)a5 = 80
(D)
。
(A) an=6n-1
(B)a1 = 5
(C)a5 = 80
(D)
。
參考答案
答案：D
難度：適中0.444444
統計：A(37),B(8),C(10),D(44),E(0)
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