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The conversion A to B is carried out by ...

The conversion A to B is carried out by the following path : `{:(C rarr D),(uarr" "darr),("A B"):}` Given : `Delta S_((A rarr C))=50` e.u. ,
`Delta S_((C rarr D))=30` e.u., `Delta S_((B rarr D))=20` e.u.
where e.u. is entropy unit then `Delta S_((A rarr B))` is

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