A) \[\upsilon =\frac{{{\upsilon }_{1}}+{{\upsilon }_{2}}}{2}\]
B) \[\frac{2}{\upsilon }=\frac{1}{{{\upsilon }_{1}}}=\frac{1}{{{\upsilon }_{2}}}\]
C) \[\upsilon =\sqrt{{{\upsilon }_{1}}{{\upsilon }_{2}}}\]
D) \[\upsilon =\sqrt{\frac{{{\upsilon }_{2}}}{{{\upsilon }_{1}}}}\]
Correct Answer: C
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