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Let ƒ(x) be a polynomial function such that ƒ(x) + ƒ ′ (x) + ƒ ′′ (x) = x 5 + 64. Then, the value of 1 x ) x ƒ( lim 1 x − → is equal to :

1. – 15
2. – 60
3. 60
4. 15

Correct answer: – 15

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