問題詳情
14. 已知(x+1)''的展開式中，xk項的係數為ak，若a4:an-2 =6:1，則n =？
(A) 11
(B) 12
(C) 13
(D) 14
(A) 11
(B) 12
(C) 13
(D) 14
參考答案
無參考答案
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