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In a structural member under fatigue loading, the minimum and maximum stresses developed at the critical point are $50$ $MPa$ and $150$ $MPa$, respectively. The endurance, yield, and the ultimate strengths of the material are $200$ $MPa$, $300$ $MPa$ and $400$ $MPa$, respectively. The factor of safety using modified Goodman criterion is

  1. $\dfrac{3}{2} \\$
  2. $\dfrac{8}{5} \\$
  3. $\dfrac{12}{7} \\$
  4. $2$

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