Chapter 17 of 19
Revision Notes
Permutation and Combination — Revision Notes
SNAP · Quantitative Aptitude
Quick revision notes for Permutation and Combination — key concepts, formulas, and definitions for SNAP Quantitative Aptitude preparation.
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Key concepts, formulas, and definitions from Permutation and Combination for SNAP Quantitative Aptitude preparation.
Key Topics to Revise
1
Factorial Notation and Basic Concepts
- Factorial notation n! = n × (n-1) × (n-2) × ... × 3 × 2 × 1
- 0! = 1 by convention
- Factorials are defined only for non-negative integers
2
Permutations - When Order Matters
- Permutation involves arrangement where order is important
- Symbol: nPr or P(n,r) represents permutations of n things taken r at a time
- Formula: nPr = n!/(n-r)! where n ≥ r
3
Combinations - When Order Doesn't Matter
- Combination involves selection where order is not important
- Symbol: nCr or C(n,r) represents combinations of n things taken r at a time
- Formula: nCr = n!/[r!(n-r)!] where n ≥ r
4
Special Cases and Advanced Applications
- Arrangements with identical objects: n!/(p₁!×p₂!×...×pₖ!)
- Distribution problems using stars and bars method
- Circular permutations: (n-1)! for distinct objects
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Key Concepts
Factorial of a natural number nPermutations count the number of waysCombinations count the number of waysIf there are M waysWhen objects are arranged in
Frequently Asked Questions
What topics are covered in Permutation and Combination for SNAP?
Permutation and Combination is an important chapter in SNAP Quantitative Aptitude. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Factorial Notation and Basic Concepts, Permutations - When Order Matters, Combinations - When Order Doesn't Matter, Special Cases and Advanced Applications.
How important is Permutation and Combination for SNAP?
Permutation and Combination is a frequently tested chapter in SNAP Quantitative Aptitude. Questions from this chapter appear regularly in previous year papers. There are 46 practice questions available for this chapter.
How to prepare Permutation and Combination for SNAP?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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