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Let A={1,2} . Find all one-to-one functi...

Let `A={1,2}` . Find all one-to-one function from A to A.

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Given,`A={1,2}`
let,`f(x)=y`
for every unique x, y should be unique.
thus,f(x) is one-one
Thus,`f(A)={1,1∣2,2}`
`f(A)={1,2∣2,1}`
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