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A, B, C and D are four resistance of 2Om...

`A`, `B`, `C` and `D` are four resistance of `2Omega`, `2Omega`, `2Omega` and `3Omega` respectivey. They are used to form a wheatstone bridge. The resistance `D` is short circuited with a resistance `R` in order to get the bridge balanced. The value of `R` will be

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