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Question

Let f be differentiable for all x. If f(1)=2 and f(x)2 for all xϵ[1,6] then

A
f(6)<8
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B
f(6)8
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C
f(6)5
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D
f(6)5
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Solution

The correct option is C f(6)8
Given that f(1)=2 and f(x)2 x[1,6]

Lagrange's mean value theorem states that if f(x) be continuous on [a,b] and differentiable on (a,b) then there exists some c between a and b such that f(c)=f(b)f(a)ba

Given that f is differentiable for all x. Therefore, lagrange's mean value theorem can be applied.

Therefore, f(c)=f(6)f(1)612 (Since, [a,b]=[1,6])

f(6)f(1)2(5)

f(6)(2)10

f(6)102

f(6)8

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