three resistances of value 1 ohm, 2 ohm and 3 ohm are connected in parallel.If the

Question

three resistances of value 1 ohm, 2 ohm and 3 ohm are connected in parallel.If the 
effective resistance of the circuit has to be 1 ohm, the value of the resistance to be connected in series to  this circuit should be?

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Steve · Answer

1/R = 1/1 + 1/2 + 1/3 = 11/6 So, the parallel resistance is 6/11 ohm. Add 5/11 ohm to make the total 1 ohm.