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The change in entropy of the system in a...

The change in entropy of the system in a process `AtoBtoC` is `25J*K^(-1)`. If the change in entropy of the system in the step `BtoC` is 15 `J*K^(-1)`, then what will be the change in entropy of the system in the step `BtoA`?

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`-101J*K^(-1)`.
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