The effective resistance of two resistors in parallel is 127  Ω. If one of the resistors is disconnected the resistance becomes 4 Ω. The resistance of the other resistor is 

(1) 4 Ω

(2) 3 Ω

(3) 127  Ω

(4) 712Ω

(2) 712=14+1R      R=3Ω  

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