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NDA2015MathematicsFunctionsActual

Consider the following statements : Statement 1: The function f R R such that f ( x )= x ^3 for all x R is one-one. Statement 2: f(a) f(b) for all a, b R if the function f is one-one. Which one of the following is correct in respect of the above statements?

Options

  1. ABoth the statements are true and Statement 2 is the correct explanation of Statement 1.
  2. BBoth the statements are true and Statement 2 is not the correct explanation of Statement 1.
  3. CStatement 1 is true but Statement 2 is false.
  4. DStatement 1 is false but Statement 2 is true.

Correct answer

A. Both the statements are true and Statement 2 is the correct explanation of Statement 1.

Step-by-step solution

aligned & f ( x )= x ^3 & f ( x ₁ )= x ₁^3 & f ( x ₂ )= x ₂^3 & if x ₁= x ₂ & then f ( x ₁ )= f ( x ₂ ) aligned So it is one-one function Hence option (1) is correct.

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