Which one of the following pairs is not correctly matched ?

- 1
  
     Boundary conditions Euler’s buckling
  
    of column   load
  
  $P i n - P i n$    $π^{2} EI / L^{2}$
- 2
  
  Boundary conditions Euler’s buckling
  
  of column   load
  
     $F i x e d - F i x e d$ $4 π^{2} EI / L^{2}$
- 3
  
     Boundary conditions Euler’s buckling
  
  of column   load
  
  $F i x e d - F r e e$    $0.25 π^{2} EI / L^{2}$
- 4
  
  Boundary conditions Euler’s buckling
  
  of column load
  
  $F i x e d - p i n$ $\sqrt{2} π^{2} EI / L^{2}$

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