Radius of a single mercury drop formed from two or three drops

1. A.
   $\left( R_{1}^{3} + R_{2}^{3} + R_{3}^{3} \right)^{\frac{1}{3}}$
2. B.
   $\ \left( R_{1}^{2} + R_{2}^{3} - R_{3}^{3} \right)^{\frac{1}{3}}$
3. C.
   $\ \left( R_{1}^{3} + R_{2}^{3} + R_{3}^{3} \right)$
4. D.
   $\left( R_{1} + R_{2} + R_{3} \right)^{3}$

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1. A.
   $R = \dfrac{R_1 + R_2}{2}$
2. B.
   $R^3 = R_1^3 + R_2^3$
3. C.
   $R^2 = R_1^2 + R_2^2$
4. D.
   $R = R_1 + R_2$

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