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Question

If f(x)=(25x4)1/4,0<x<5, then f(f(13))=

A
13
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B
31/3
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C
27
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D
23
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Solution

The correct option is A 13
f(f(x))=(25(f(x))4)14f(f(x))=[2525+x4]14f(f(x))=xf(f(13))=13

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