9.
数列\(\{a_{n}\}\)的前\(n\)项和为\(S_{n}\),若数列\(\{a_{n}\}\)的各项按如下规律排列:\( \dfrac{1}{2}\),\( \dfrac{1}{3}\),\( \dfrac{2}{3}\),\( \dfrac{1}{4}\),\( \dfrac{2}{4}\),\( \dfrac{3}{4}\),\( \dfrac{1}{5}\),\( \dfrac{2}{5}\),\( \dfrac{3}{5}\),\( \dfrac{4}{5}\),\(…\),\( \dfrac{1}{n}\),\( \dfrac{2}{n}\),\(…\),\( \dfrac{n-1}{n}\),\(…\),有如下运算和结论:其中正确的结论有________\(.(\)将你认为正确的结论序号都填上\()\)
\(①a_{24}= \dfrac{3}{8}\);
\(②\)数列\(a_{1}\),\(a_{2}+a_{3}\),\(a_{4}+a_{5}+a_{6}\),\(a_{7}+a_{8}+a_{9}+a_{10}\),\(…\)是等比数列;
\(③\)数列\(a_{1}\),\(a_{2}+a_{3}\),\(a_{4}+a_{5}+a_{6}\),\(a_{7}+a_{8}+a_{9}+a_{10}\),\(…\)的前\(n\)项和为\(T_{n}= \dfrac{n^{2}+n}{4}\);
\(④\)若存在正整数\(k\),使\({S}_{k} < 10,{S}_{k+1}\geqslant 10 \),则\({a}_{k}= \dfrac{5}{7} \).