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An ideal gas expands isothermally from a volume V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1 and final pressure is P3. The total work done is W. Then -
(1) P3>P1, W>0
(2) P3<P1, W<0
(3) P3>P1, W<0
(4) P3=P1, W=0