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If the function f : R – {1, – 1} → A defined by f(x) = 2 2 x – 1 x , is surjective, then A is equal to :

1. R – {– 1}
2. R – [– 1, 0)
3. R – (– 1, 0)
4. [0, ∞ )

Correct answer: R – [– 1, 0)

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