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Let,f : [0,1] rarr [0, 1] be defined by ...

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

A

1)constant

B

2)1+x

C

3)x

D

4)none of these

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The correct Answer is:
C
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