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The graph shown gives the temperature al...

The graph shown gives the temperature along an `X` axis that extends directly through a wall consisting of three layers `A`, `B` and `C`. The air temperature on one side of the wall is `150^(@)C` and on the other side is `80^(@)C`. Thermal conduction through the wall is steady. out of the three layers `A` `B` and `C` thermal conductivity is greatest of the layer

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