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Then f decreases in the interval
  • a)
    (- ∞,-2)
  • b)
    (–2, –1)
  • c)
    (1, 2)
  • d)
    (2,+∞)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Then f decreases in the intervala)(- ∞,-2)b)(–2, –1...
For decreasing function, f ' (x) < 0
⇒ ex (x – 1) (x – 2) < 0  ⇒ (x – 1) (x – 2) < 0
⇒ 1 < x < 2,
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Then f decreases in the intervala)(- ∞,-2)b)(–2, –1)c)(1, 2)d)(2,+∞)Correct answer is option 'C'. Can you explain this answer?
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