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A machine element XY, fixed at end X, is subjected to an axial load P, transverse load F, and a twisting moment T at its free end Y. The most critical point from the strength point of view is

  1. a point on the circumference at location Y
  2. a point at the center at location Y
  3. a point on the circumference at location X
  4. a point at the center at location X
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