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Let f : R → (0, ∞ ) be strictly increasing function such that ) x ( f ) x 7 ( f lim x ∞ → = 1. Then, the value of ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ∞ → 1 – ) x ( f ) x 5 ( f lim x is equal to

1. 0
2. 7/5
3. 1
4. 4

Correct answer: 0

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