If f(x) is differentiable for all x∈ℝ so that f(2)=4,f1(x)≥5 for all x∈[2,6] , then a possible value of f(6) is
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a
12
b
15
c
20
d
27
answer is D.
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Detailed Solution
Using mean value theorem f(b)−f(a)b−a=f1(c)⇒f(6)-f(2)=(6-2)f'(c) where c∈(2,6)⇒f(6)=f(2)+4f'(c)=4+4f'(c)≥4+4(5):-f'(x)≥5⇒f(6)≥24 By options, the possible value of f(6) is 27