First slide
Functions (XII)
Question

If X = {1, 2, 3, 4,}, then a one-one onto mapping f: X  X such that f(1) = 1, f(2)  2 and f(4)  4 is given by 

Moderate
Solution

 f in (a) is clearly one-one and onto also satisfies f(1) = 1, f(2) =3 2 and f(4) =2 4 .

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