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 :
- A one-one
- B onto
- C both one-one and onto
- D neither one-one nor onto
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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