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Question

If f(x)=x3x+1, then f[f{f(x)}] equals

A
x
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B
x
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C
x2
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D
1x
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Solution

The correct option is A x
f(f(x))=x3x+13x3x+1+1
=x+31x

f(f(f(x))) =x+31x3x+31x+1

=4x4=x

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