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Let f : [0, 1] → [0, 1] be defined by f (x) ={x, ,if is rational, 1- x, if isirrational}

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Let f : [0, 1] → [0, 1] be defined by f (x) ={x, ,if is rational, 1- x, if isirrational} Then (f o f) x is

(A) constant 

(B) 1 + x

(C) x 

(D) none of these

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Answer is (C)

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