Class 12 Mathematics - Relations and Functions - Onto function Expert Quiz

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वास्तविक संख्याओं पर (aRb) तभी जब \(\lfloor a\rfloor=\lfloor b\rfloor\)। यह संबंध कैसा है?

On real numbers, (aRb) iff \(\lfloor a\rfloor=\lfloor b\rfloor\). What type of relation is it?

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Correct Answer

A. समतुल्यता संबंधequivalence relation

Step 1

Concept

For every (a), \(\lfloor a\rfloor=\lfloor a\rfloor\), so it is reflexive.

Step 2

Why this answer is correct

Equality remains true when reversed, so it is symmetric.

Step 3

Exam Tip

Having the same greatest-integer value passes through a middle element, so it is transitive. चरण 1: हर (a) के लिए \(\lfloor a\rfloor=\lfloor a\rfloor\), इसलिए प्रतिवर्तिता है। चरण 2: बराबरी पलटने पर भी सही रहती है, इसलिए सममितता है। चरण 3: समान पूर्णांक भाग की शृंखला आगे भी समान पूर्णांक भाग देती है, इसलिए संक्रामकता है।

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वास्तविक संख्याओं पर (aRb) तभी जब \(\lfloor a\rfloor=\lfloor b\rfloor\)। \(\frac{5}{2}\) का समतुल्यता वर्ग कौन सा है?

On real numbers, (aRb) iff \(\lfloor a\rfloor=\lfloor b\rfloor\). What is the equivalence class of \(\frac{5}{2}\)?

Explanation opens after your attempt
Correct Answer

A. ([2,3))

Step 1

Concept

\(\frac{5}{2}=2.5\) has greatest-integer value (2).

Step 2

Why this answer is correct

Real numbers with greatest-integer value (2) lie in ([2,3)).

Step 3

Exam Tip

Do not include the right endpoint (3), because its greatest-integer value is (3). चरण 1: \(\frac{5}{2}=2.5\) का पूर्णांक भाग (2) है। चरण 2: जिन वास्तविक संख्याओं का पूर्णांक भाग (2) है, वे ([2,3)) में आती हैं। चरण 3: दाएं सिरे (3) को शामिल न करें क्योंकि उसका पूर्णांक भाग (3) है।

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