FunctionHard
Question
Let f: R → R be a positive increasing function with 
= 1. Then 
=
= 1. Then = Options
A.
B.
C.3
D.1
Solution
f(x) is a positive increasing function
⇒ 0 < f(x) < f(2x) < f(3x)
⇒ 0 < 1 <
⇒
By sandwich theorem.
⇒
⇒ 0 < f(x) < f(2x) < f(3x)
⇒ 0 < 1 <
⇒
By sandwich theorem.
⇒
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