6.
已知等差数列\(\{a_{n}\}\)的前\(n\)项和为\(S_{n}\),等比数列\(\{b_{n}\}\)的各项均为正数,公比为\(q\),且满足:\(a_{1}=3\),\(b_{1}=1\),\(b_{2}+S_{2}=12\),\(S_{2}=b_{2}q.\)
\((1)\)求\(a_{n}\)与\(b_{n}\);
\((2)\)设\(c_{n}=3b_{n}-2λ⋅ \dfrac {a_{n}}{3}(λ∈R)\),若数列\(\{c_{n}\}\)是递增数列,求\(λ\)的取值范围.