A) 27 \[\Omega \]
B) 18 \[\Omega \]
C) 90\[\Omega \]
D) 3\[\Omega \]
Correct Answer: D
Solution :
The three resistances between A and B are parallel, \[\frac{1}{{{R}_{comb}}}=\frac{1}{{{R}_{1}}}+\frac{1}{{{R}_{2}}}+\frac{1}{{{R}_{3}}}\] \[=\frac{1}{9}+\frac{1}{9}+\frac{1}{9}\] \[\frac{1}{{{R}_{comb}}}=\frac{3}{9}\] \[\Rightarrow \] \[{{R}_{comb}}=3\Omega \]
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