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What is the condition for a function f to be strictly increasing if f be continuous and differentiable on (a,b)?(a) f’(x) > 0 ∀ x1, x2 ∈ (a,b)(b) f’(x) < 0 ∀ x1, x2 ∈ (a,b)(c) f’(x) ≤ 0 ∀ x1, x2 ∈ (a,b)(d) f’(x) = 0 ∀ x1, x2 ∈ (a,b)The question was asked during an interview for a job.The origin of the question is Derivatives Application in portion Application of Derivatives of Mathematics – Class 12

Answer»

Right answer is (a) f’(X) > 0 ∀ x1, x2 ∈ (a,B)

The explanation: The condition for a function ‘f’ to be STRICTLY INCREASING is f’(x) > 0 ∀ x1, x2 ∈ (a,b) where the the function ‘f’ should be continuous and differentiable on (a,b).



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