Given the coefficient of in the expansion of is 189,show that the value of n = 7.）我知道意思嗄～^^ coeffient后面是X^2;of后面是(1+3x)^n
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题目内容：
Given the coefficient of in the expansion of is 189,show that the value of n = 7.）
我知道意思嗄～^^ coeffient后面是X^2;of后面是(1+3x)^n
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