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For any function fof ^-1(x) is equal to?

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For any function fof ^-1(x) is equal to?

(a) x

(b) 1

(c) x^2

(d) none of the mentioned

I had been asked this question in a national level competition.

I want to ask this question from Inverse of a Function topic in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Best answer
Correct choice is (a) x

The explanation: Compostion of a function with its inverse gives x.

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