2. Determine se a sequência é monótona e limitada. \( \begin{array}{llll}\text { a) }\left\{\frac{2 n-1}{4 n-1}\right\} & \text { d) }\left\{\frac{n^{3}-1}{n}\right\} & \text { g) }\left\{\frac{n!}{3^{n}}\right\} & \text { j) }\left\{\frac{n!}{1 \cdot 3 \cdot 5 \cdot 7 \ldots(2 n-1)}\right\} \\ \text { b) }\left\{\frac{1-2 n^{2}}{n^{2}}\right\} & \text { e) }\left\{\frac{1}{n+\operatorname{sen} n^{2}}\right\} & \text { h) }\left\{\frac{n^{n}}{n!}\right\} & \text { L) }\left\{\frac{1 \cdot 3.5 \cdot 7 \ldots(2 n-1)}{2^{n} \cdot n!}\right\} \\ \text { c) }\{\operatorname{sen} n \pi\} & \text { f) }\left\{\frac{2^{n}}{1+2^{n}}\right\} & \text { i) }\left\{\frac{n}{2^{n}}\right\} & \text { m) }\left\{\frac{1.3 .5 \ldots . .(2 n-1)}{2.4 .6 .8 \ldots(2 n)}\right\}\end{array} \)