（Ⅰ）求数列{a_n}，{b_n}的通项公式；

（Ⅱ）令c_n= $\frac{3a_n}{n\left(b_n+1\right)}$ ，求数列{c_n}的前n项和T_n．

读下面的古诗，完成题目。

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