Class 9 Math – Exercise 1.2 | Sets and Set Notation | Fully Solved
Welcome to Smart Study Notes! Here you'll find fully solved solutions for Class 9 Math Exercise 1.2 based on the topic Sets and Set Notation. Explanations are in both Urdu and English so every student can understand easily.
📘 Topics Covered:
- Definition of Sets (مجموعہ)
- Types of Sets
- Set Builder Notation
- Roster Form
- Checking Elements
📗 Sample Question:
Q1: Write the following sets in roster form:A = {x : x is a natural number less than 6} Solution:
A = {1, 2, 3, 4, 5} (کیونکہ یہ تمام قدرتی اعداد ہیں جو 6 سے کم ہیں) ---
📌 Urdu Explanation:
Set وہ collection ہوتی ہے جس میں مختلف چیزیں (elements) شامل ہوں۔ جیسے:
A = {1, 2, 3} ایک set ہے جس میں تین numbers ہیں۔
Set Builder Form میں ہم ایسے لکھتے ہیں:
A = {x : x ∈ N, x < 6}
🧠 Pro Tip:
ہر سوال میں پہلے سمجھیں کہ کس قسم کا Set دیا گیا ہے، پھر اسے Roster یا Set-builder form میں convert کریں۔
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