A) \[\frac{11d}{7}\]
B) \[\frac{18d}{11}\]
C) \[\frac{13d}{9}\]
D) \[\frac{23d}{18}\]
Correct Answer: B
Solution :
\[{{\rho }_{mix}}\]= \[\frac{3m}{{{V}_{1}}+{{V}_{2}}+{{V}_{3}}}=\frac{3m}{\frac{m}{d}+\frac{m}{2d}+\frac{m}{3d}}\]= \[\frac{3\times 6}{11}d=\frac{18}{11}d\]
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