In Wheatstone's bridge P = 9 ohm, Q = 11...

In Wheatstone's bridge `P = 9 ohm`, `Q = 11 ohm`, `R = 4 ohm` and `S = 6 ohm`. How much resistance must be put in parallel to the resistance `S` to balance the bridge

24 ohm

`(44)/(9)` ohm

`26.4` ohm

`18.7` ohm

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