The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in the figure is

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Strategy:
 On a P-V diagram, the magnitude of work done is equal to the area under the process curve.

Step 1: Analyze the P-V plot
Path ABC:
- BC is a constant volume line (no work).
- AB is a constant pressure line at .
- Volume change is from  to . (Wait, check the image carefully).

Step 2: Calculation
Area 
Area .

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