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f:{x,y,z} to {a,b,c} is a bijection . It...

`f:{x,y,z} to {a,b,c}` is a bijection . It is given that exactly one of the following statements a,b,c, is true and the remaining two are false.
1) `f(x)=a`
2) `f(y) ne a`
3) If `f(z) ne b` then find `f^(-1)(a)`.

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