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If f(x)> x ;AA x in R. Then the equation...

If `f(x)> x ;AA x in R.` Then the equation `f(f(x))-x=0,` has

A

exactly once in(a,b)

B

atmost once in (a,b)

C

atleast once in (a,b)

D

None of these

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The correct Answer is:
B
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