A certain steel has proportionality limit of $3000 k g / c m^{2}$ in simple tension. It is subjected to principal stresses of

$1200 k g / c m^{2}$ (tensile), $600 k g / c m^{2}$ (tensile) and $300 k g / c m^{2}$

- 1
  $1.50$
- 2
  
  $1.75$
- 3
  
  $1.80$
- 4
  
  $2.00$

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