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Let f : [0, 1] \rightarrow [0, 1]  be defined by f(x) =   { x, if is rational
                                                                              1-x , if is irrational}.
Then (fof)x is

(a) constant

(b) 1 + x

(c) x

(d) None of these 
 

Answers (1)

(c) 

Here, f : [0, 1] \rightarrow [0, 1]\\

\\f = f\textsuperscript{-1} \\ Therefore, (fof)x = x\\

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