1.

If X and Y are two non-empty sets, where f:XtoY is function defined such that f(C)={f(x):x inC}andf'(D)={x:f(x)inD} for DsubeYfor any AsubeXandBsubeY, then :

Answer»

`f(f^(-1)(B))=B` only if `B=f(X)`
`f(f^(-1)(B))=B` only if `Bsubf(x)`
`f(f^(-1)(B))=B` only if `Bsubef(x)`
`f(f^(-1)(B))` NEVER equals B.

Answer :B


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