Work done $=$ Area under the curve

In The given graph, More the area below the path followed, More is the work done Therefore, In the $\mathrm{P}-\mathrm{V}$ Graph. The area under path $3$is more than $2$, which is more than $1$. Therefore, ${\mathrm{w}}_1<{\mathrm{w}}_2<{\mathrm{w}}_3$.