Class 12 Mathematics - Relations and Functions - One-one function Expert Quiz

Level 9 • 2/50 questions • 25 seconds per question.

Level readiness 2/50 Questions
Time Left 00:50 25 sec/question
RewardsCoins + XP
ModeClassic Quiz
Share
This level needs 48 more active questions. Admin panel me same class, subject, difficulty aur level_no 9 par question add karein.
Question 1 / 2 0 score
Answered 0/2 Correct 0 Time 00:50

यदि (A) में (n) तत्व हैं, तो ऐसे प्रतिवर्ती संबंधों की संख्या क्या है जिनमें कोई विशेष अविकर्ण युग्म ((p,q)), जहां \(p\neq q\), अवश्य शामिल हो?

If (A) has (n) elements, how many reflexive relations must contain one fixed non-diagonal pair ((p,q)), where \(p\neq q\)?

Explanation opens after your attempt
Correct Answer

A. \(2^{n^2-n-1}\)

Step 1

Concept

A reflexive relation must contain the (n) diagonal pairs.

Step 2

Why this answer is correct

There are \(n^2-n\) non-diagonal pairs, and one fixed non-diagonal pair is also compulsory.

Step 3

Exam Tip

The remaining \(n^2-n-1\) pairs are optional, giving \(2^{n^2-n-1}\). चरण 1: प्रतिवर्ती संबंध में (n) विकर्ण युग्म अनिवार्य हैं। चरण 2: अविकर्ण युग्मों की संख्या \(n^2-n\) है, जिनमें से एक विशेष युग्म भी अनिवार्य कर दिया गया। चरण 3: बाकी \(n^2-n-1\) युग्म स्वतंत्र हैं, इसलिए संख्या \(2^{n^2-n-1}\) है।

Open Question Page
Ask Friends

यदि \(A=\{1,2,3,4\}\), तो ऐसे प्रतिवर्ती संबंधों की संख्या कितनी है जिनमें ठीक (2) अविकर्ण युग्म हों और ((1,2)) उनमें से एक हो?

If \(A=\{1,2,3,4\}\), how many reflexive relations have exactly (2) non-diagonal pairs and ((1,2)) is one of them?

Explanation opens after your attempt
Correct Answer

A. 11

Step 1

Concept

The four diagonal pairs are compulsory.

Step 2

Why this answer is correct

Exactly (2) non-diagonal pairs are needed and ((1,2)) is already fixed.

Step 3

Exam Tip

The second non-diagonal pair can be chosen from the remaining (11), so there are (11) relations. चरण 1: चार विकर्ण युग्म अनिवार्य हैं। चरण 2: ठीक (2) अविकर्ण युग्म चाहिए और ((1,2)) पहले से तय है। चरण 3: दूसरा अविकर्ण युग्म बाकी (11) में से चुना जाएगा, इसलिए (11) संबंध बनेंगे।

Open Question Page
Ask Friends
FAQs

Class 12 Mathematics Quiz FAQs

How many questions are in this quiz?

This level is designed for 50 active questions. Currently 2 questions are available for the selected class and difficulty.

Is there a timer in this quiz?

Yes, the timer uses 25 seconds per question for Expert difficulty and shows the total remaining time on the page.

Can I open each question separately?

Yes, every question has its own SEO-friendly page with answer, explanation and related practice links.