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For x ∈ R – {0, 1}, let f 1 (x) = x 1 , f 2 (x) = 1 – x and f 3 (x) = x – 1 1 be three given functions. If a function, J(x) satisfies (f 2 | J | f 1 )(x) = f 3 (x) then J(x) is equal to :

1. ) x ( f x 1 3
2. f 2 (x)
3. f 3 (x)
4. f 1 (x)

Correct answer: f 3 (x)

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