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TS EAMCET · Maths · Limits

f:R+R be an increasing function such that fx>0 for all x. If limxf9xf3x=1, then limxf6xf3x=

  1. A 1
  2. B 2
  3. C 32
  4. D 23
Verified Solution

Answer & Solution

Correct Answer

(A) 1

Step-by-step Solution

Detailed explanation

f is an increasing function. Given, limx→∞f(9x)f(3x) =1 Consider, 3x<6x<9x ⇒f(3x)<f(6x)<f(9x) ⇒f(3x)f(3x)<f(6x)f(3x)<f(9x)f(3x) Let x→∞ ⇒1<limx→∞f(6x)f(3x)<limx→∞f(9x)f(3x)…
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