The resistance in parallel road ways given by formula $$\frac{1}{{\sqrt R }}$$
A. $${R_1} - {R_2} - {R_3}.\,.\,.\,.\,.\,{R_n}$$
B. $$\frac{1}{{{R_1}}} + \frac{1}{{{R_2}}} + \frac{1}{{{R_3}}}.\,.\,.\,.\,.\,\frac{1}{{{R_n}}}$$
C. $$\frac{1}{{\sqrt {{R_1}} }} + \frac{1}{{\sqrt {{R_2}} }} + \frac{1}{{\sqrt {{R_3}} }}.\,.\,.\,.\,.\,\frac{1}{{\sqrt {{R_n}} }}$$
D. $$\frac{1}{{\sqrt {{R_1}} }} - \frac{1}{{\sqrt {{R_2}} }} - \frac{1}{{\sqrt {{R_3}} }}.\,.\,.\,.\,.\, - \frac{1}{{\sqrt {{R_n}} }}$$
Answer: Option C
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