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What is the condition for a function f to be strictly decreasing 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 posed to me in an internship interview.I want to ask this question from Derivatives Application in chapter Application of Derivatives of Mathematics – Class 12

Answer»

Right ANSWER is (b) f’(x) < 0 ∀ x1, x2 ∈ (a,b)

The explanation: The MATHEMATICAL EXPRESSION for strictly DECREASING function is f’(x) < 0 ∀ x1, x2 ∈ (a,b). This is the condition for strictly decreasing function and only possible when function ‘f’ is continuous and differentiable on (a,b).



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