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Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio of 1 : 2 and if no resistance value is frac-tional, the largest of three resistances in ohm is
Let the three resistances be
R₁,R₂,R₃, with R₁ : R₂ = 1 : 2 Given:
1/R₁ + 1/R₂ + 1/R₃ = 1
Solving for integer values, the largest resistance is 6 ohms. Answer: (c) 6.
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