For a prismatic beam element, if the stiffness matrix is \(\frac{{2EI}}{L}\left[ {\begin{array}{*{20}{c}} 2&1\\ 1&2 \end{array}}\right]\) , then the flexibility matrix is
1
\(\frac{L}{{2EI}}\left[ {\begin{array}{*{20}{c}} {0.5}&1\\ 1&{0.5} \end{array}}\right]\)
2
\(\frac{L}{{6EI}}\left[ {\begin{array}{*{20}{c}} 1&{ - 2}\\ { - 2}&1 \end{array}}\right]\)
3
\(\frac{L}{{6EI}}\left[ {\begin{array}{*{20}{c}} 2&{ - 1}\\ { - 1}&2 \end{array}}\right]\)
4
\(\frac{L}{{3EI}}\left[ {\begin{array}{*{20}{c}} 2&{ - 1}\\ { - 1}&2 \end{array}}\right]\)