If two springs of stiffness $K_{1}$ and $K_{2}$ are connected in series, the stiffness of the combined spring is

- 1
  
  $\frac{K_{1} K_{2}}{K_{1} + K_{2}}$
- 2
  
  $\frac{K_{1} + K_{2}}{K_{1} K_{2}}$
- 3
  
  $K_{1} + K_{2}$
- 4
  
  $K_{1} K_{2}$

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