A) \[{{C}_{1}}+{{C}_{2}}+{{C}_{3}}\]
B) \[1/({{C}_{1}}+{{C}_{2}}+{{C}_{3}})\]
C) \[{{(C_{1}^{-1}+C_{2}^{-1}+C_{3}^{-1})}^{-1}}\]
D) None of these
Correct Answer: C
Solution :
\[\frac{1}{{{C}_{R}}}=\frac{1}{{{C}_{1}}}+\frac{1}{{{C}_{2}}}+\frac{1}{{{C}_{3}}}\] Þ \[{{C}_{R}}={{(C_{1}^{-1}+C_{2}^{-1}+C_{3}^{-1})}^{-1}}\]
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