Three resistance P, Q, R each of 2 Omega...

Three resistance P, Q, R each of 2 Omega and an unknown resistance S from the four amrs of a Wheatstone's bridge circuit. When a resistance of 6 Omega is connected in parallel to S the bridge gets balanced. What is the value of S ?

1Ohm

2 ohm

3 ohm

6 ohm

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