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What is the mathematical expression for a function to be strictly decreasing on (a,b)?(a) x1 = x2 ⇒ f(x1) ≤ f(x2) ∀ x1, x2 ∈ (a,b)(b) x1 < x2 ⇒ f(x1) > f(x2) ∀ x1, x2 ∈ (a,b)(c) x1 < x2 ⇒ f(x1) < f(x2) ∀ x1, x2 ∈ (a,b)(d) x1 < x2 ⇒ f(x1) = f(x2) ∀ x1, x2 ∈ (a,b)This question was addressed to me during an interview.My question is based upon Derivatives Application topic in chapter Application of Derivatives of Mathematics – Class 12

Answer»

The correct answer is (b) x1 < x2 ⇒ f(x1) > f(x2) ∀ x1, x2 ∈ (a,b)

To EXPLAIN: There are two TYPES of DECREASING functions in maxima and minima. They are strictly decreasing and monotonically decreasing. The MATHEMATICAL EXPRESSION for strictly decreasing function is x1 < x2 ⇒ f(x1) > f(x2) ∀ x1, x2 ∈ (a,b).



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