Three solid spheres have their radii $r_{1}, r_{2}$ and $r_{3}$. The spheres are melted to form a single solid sphere of a bigger radius. The radius of the new sphere is:

  • A
    $(r_{1} + r_{2} + r_{3})$
  • B
    $(r_{1}^{2} + r_{2}^{2} + r_{3}^{2})^{1/2}$
  • C
    $(r_{1}^{3} + r_{2}^{3} + r_{3}^{3})^{1/3}$
  • D
    $(r_{1}^{4} + r_{2}^{4} + r_{3}^{4})^{1/4}$

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