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If f:[0,1] rarr [0,1] be difined by f(...

If `f:[0,1] rarr [0,1] ` be difined by `f(x) = {(x," if x is rational"),(1-x," if x is irrational"):}` then fof(x) is ............

A

constant

B

1 + x

C

x

D

None of these

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The correct Answer is:
C
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