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GATE Overflow Test Series | Mixed Subjects | Test 1 | Question: 5

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Given that $f(x)=3x-6\implies y = 3x-6$
$f$ and  $f^{-1}$ cancels each other and so $f(f(f^{-1}(3)))= f(3) = 3\times 3 - 6 = 3.$
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