NEB NotesNepal
Unit 1 • Class 9Compulsory Mathematics (Mat.091)

Sets & Cardinality of Two Sets (Venn Diagrams)

समूह तथा दुई समूहको गणनात्मकता (भेनलचित्र)

Universal set, subset, union, intersection, difference, complement of sets, and solving 2-circle Venn diagram word problems using cardinal formulas.

Lesson Summary & Key Concepts

Set cardinality relationships with 2-set Venn diagrams, commercial arithmetic (marked price, discount, profit/loss), and calculation of 13% Nepal Value Added Tax (VAT).

Textbook Exercises & Solutions

Showing 1 of 1 Solved Questions
Question 1• 4 Marks

High-Yield Exam Focus Questions (1)

CDC Spec Grid Verified

High-probability exam questions curated specifically for Sets & Cardinality of Two Sets (Venn Diagrams).

NEB PriorityHigh-Frequency 5-Mark Question in Grade 9 Annual Examination5 Marks

Exam Rationale: Grade 9 Mathematics Specification Table: Compound Depreciation and Taxation.

Quick Revision Takeaways

Common Exam Pitfalls to Avoid

⚠️ Common Error: Calculating 13% VAT directly on the Marked Price before deducting trade discount.

✓ Correct Approach: First subtract discount to get net Selling Price (SP), then apply 13% VAT.

Why: VAT is a tax on actual realized transaction value.

Content Provenance & Verification
Editorial Verified & Published
Original Author / ContributorCDC Mathematics Education Panel
Verified BySenior Subject Specialist (TU / NEB Panel)
Curriculum Versionv1.0 (CDC 2078/2080 Grid)
Last Verified Date2026-10-23
Legitimate Official Curriculum References
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