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If f (x)= [{:(x,,, "if x is rational"), ...

If `f (x)= [{:(x,,, "if x is rational"), (1-x,,," if x is irrational "):},` then number of points for `x in R,` where `y =f (f (x))` discontinous 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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