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Chapter 1 of 14
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Sets

CBSE · Class 11 · Mathematics

Flashcards for Sets — CBSE Class 11 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.

146 questions60 flashcards5 concepts

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Card 1Sets and representations

Odd natural numbers less than 10 are written in roster form. What is the set and why is it a set?

Answer

Step 1: List the numbers less than 10 that are odd natural numbers: 1, 3, 5, 7, 9. Step 2: Write the roster form: {1, 3, 5, 7, 9}. Step 3: This is a set because the collection is well-defined. It is p

Card 2समुच्चय और निरूपण

10 से कम विषम प्राकृतिक संख्याएँ रोस्टर रूप में लिखी जाती हैं। समुच्चय क्या है और यह समुच्चय क्यों है?

Answer

चरण 1: 10 से कम वे संख्याएँ लिखिए जो विषम प्राकृतिक संख्याएँ हैं: 1, 3, 5, 7, 9. चरण 2: रोस्टर रूप लिखिए: {1, 3, 5, 7, 9}. चरण 3: यह एक समुच्चय है क्योंकि यह संग्रह सु-स्पष्ट है। यह साफ़-साफ़ तय करना

Card 3Set-builder form

Write the set of vowels in English alphabet in set-builder form.

Answer

Step 1: Identify the common property: each element is a vowel in English alphabet. Step 2: Use the set-builder form: V = {x : x is a vowel in English alphabet} Step 3: Here x is the element variable.

Card 4समुच्चय-निर्माण रूप

अंग्रेज़ी वर्णमाला के स्वरों का समुच्चय समुच्चय-निर्माण रूप में लिखिए।

Answer

चरण 1: सामान्य गुण पहचानिए: प्रत्येक अवयव अंग्रेज़ी वर्णमाला का एक स्वर है। चरण 2: समुच्चय-निर्माण रूप का उपयोग कीजिए: V = {x : x is a vowel in English alphabet} चरण 3: यहाँ x अवयव चर है। उत्तर: V = {

Card 5Set-builder to roster

Write A = {x : x is a natural number and 3 < x < 10} in roster form.

Answer

Step 1: Find natural numbers strictly between 3 and 10. Step 2: The numbers are 4, 5, 6, 7, 8, 9. Step 3: Write them in roster form. Answer: A = {4, 5, 6, 7, 8, 9} Quick check: 3 and 10 are not includ

Card 6समुच्चय-निर्माण से रोस्टर

A = {x : x एक प्राकृतिक संख्या है और 3 < x < 10} को रोस्टर रूप में लिखिए।

Answer

चरण 1: 3 और 10 के बीच की प्राकृतिक संख्याएँ ज्ञात कीजिए। चरण 2: संख्याएँ हैं 4, 5, 6, 7, 8, 9. चरण 3: इन्हें रोस्टर रूप में लिखिए। उत्तर: A = {4, 5, 6, 7, 8, 9} त्वरित जाँच: 3 और 10 शामिल नहीं हैं क्य

Card 7Well-defined collections

Is the collection of five most renowned mathematicians of the world a set? Give the reason.

Answer

Step 1: A set must be well-defined. Step 2: The phrase most renowned is subjective and can change from person to person. Step 3: Because the membership rule is not fixed, the collection is not a set.

Card 8सु-स्पष्ट संग्रह

विश्व के पाँच सबसे प्रसिद्ध गणितज्ञों का संग्रह क्या समुच्चय है? कारण दीजिए।

Answer

चरण 1: एक समुच्चय सु-स्पष्ट होना चाहिए। चरण 2: सबसे प्रसिद्ध वाक्यांश व्यक्तिपरक है और व्यक्ति-व्यक्ति के अनुसार बदल सकता है। चरण 3: क्योंकि सदस्यता का नियम निश्चित नहीं है, यह संग्रह समुच्चय नहीं है।

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Frequently Asked Questions

What are the important topics in Sets for CBSE Class 11 Mathematics?
Key topics in Sets include How to Find Complement, Union, Intersection, and Difference — Step-by-Step Decision Flowchart, Chapter Overview — Sets and All Key Concepts, Chapter 1: Sets — Complete Concept Map. These are the concepts CBSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Sets — CBSE Class 11 Mathematics?
Understand the core concepts first, then work through the 146 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Sets?
There are 60 flashcards for Sets covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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