已知数列\(\{an\}\)的首项\({a}_{1}= \dfrac{3}{5},{a}_{n+1}= \dfrac{3{a}_{n}}{2{a}_{n}+1},n∈{N}^{*} \).
\((1)\)求证:数列\(\{ \dfrac{1}{{a}_{n}}-1\} \)为等比数列;
\((2)\)记\({S}_{n}= \dfrac{1}{{a}_{1}}+ \dfrac{1}{{a}_{2}}+...+ \dfrac{1}{{a}_{n}} \),若\(S_{n} < 101\),求最大正整数\(n\)的值;
\((3)\)是否存在互不相等的正整数\(m\),\(s\),\(n\),使\(m\),\(s\),\(n\)成等差数列,且\(a_{m}-1\),\(a_{s}-1\),\(a_{n}-1\)成等比数列?如果存在,请给予证明;如果不存在,请说明理由.