Question: Three reservoirs are at temperatures T1, T2, and T3. A Carnot engine is positioned between T1 and T2, a second Carnot engine between T2 and

Three reservoirs are at temperatures T1, T2, and T3. A Carnot engine is positioned between T1 and T2, a second Carnot engine between T2 and T3, and a third Carnot engine between T1 and T3. Express the efficiency η3 of the third Carnot engine in terms of the efficiencies η1 and η2 of the other two engines.

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