Question

three resistance of 10ohms ,15ohms and 30ohms are connected in parallel. the total resistance of the combination is
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Answer 1

Net Resistance = $\frac{1}{r_{1} } + \frac{1}{r_{2} } + \frac{1}{r_{3} }$

                              = $\frac{1}{10} + \frac{1}{15} + \frac{1}{30} \\\\=\frac{3+2+1}{30} =\frac{6}{30} = \frac{1}{5}$

Hence the net resistance is = 5Ω