A) \[{{\rho }_{1}}+{{\rho }_{2}}\]
B) \[\frac{{{\rho }_{1}}+{{\rho }_{2}}}{2}\]
C) \[2\,({{\rho }_{1}}+{{\rho }_{2}})\]
D) \[\sqrt{{{\rho }_{1}}{{\rho }_{2}}}\]
Correct Answer: B
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