Binomial Theorem (id: 79bfca31c)

本题目来源于试卷:  Binomial Theorem ，类别为 IB数学

[填空题]
$\text { In the expansion of }(2 x+1)^{n} \text {, the coefficient of the term in } x^{2} \text { is } 40 n \text {, where } n \in \mathbb{Z}^{+} \text {. Find } n \text {. }$   

参考答案: 21


本题详细解析:

微信扫一扫，分享更方便