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A,B ,C and D are four heat reservoirs at...

A,B ,C and D are four heat reservoirs at temperatures 800K ,400K, 200K and 100K are respectively .Now 4 joules of heat is transferred from A to B,2 joules of heat is transferred from B to C and1 joule of heat is transferred from C to D. what will be the change in entropy of the system A,B,C and D?

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