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CUET · MATHS · PYQ PAPER 2023

The Greatest Integer Function \(f: R \rightarrow R\) given by \(f(x)=[x], x \in R\) and \([x]\) denotes the greatest integer less than or equal to \(x\) is :

  1. A one-one
  2. B onto
  3. C both one-one and onto
  4. D neither one-one nor onto
Verified Solution

Answer & Solution

Correct Answer

(D) neither one-one nor onto

Step-by-step Solution

Detailed explanation

\(f(1.2) = 1\), \(f(1.5) = 1\). Since \(1.2 \neq 1.5\), \(f(x)\) is not one-one. For \(y = 0.5 \in R\), there is no \(x \in R\) such that \(f(x) = [x] = 0.5\). Therefore, \(f(x)\) is not onto. Thus, \(f(x)\) is neither one-one nor onto.
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