Permutation and Combination — Study Plan
CAT · Quantitative Aptitude
Step-by-step Permutation and Combination study plan for CAT Quantitative Aptitude 2026 — structured month-wise approach to mastering this chapter.
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A structured approach to studying Permutation and Combination for CAT Quantitative Aptitude.
Study Plan for Permutation and Combination
Day 1–2: Learn the Theory
Study the chapter thoroughly. Note down definitions, formulas, and key concepts.
Day 3: Practice Problems
Solve practice questions and previous year CAT problems. There are 55 questions available for this chapter.
Day 4: Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding.
What to Focus On
- n! = n × (n-1) × (n-2) × ... × 3 × 2 × 1
- 0! = 1 by definition
- Factorials are defined only for non-negative integers
- If task 1 has M ways, task 2 has N ways, then total ways = M × N
- Extends to any number of sequential tasks
- Tasks must be independent of each other
- Order of arrangement is important in permutations
- Formula: nPr = n!/(n-r)! where n ≥ r
- nPn = n! (all objects arranged)
Common Mistakes to Avoid
Permutation and Combination formulas can be used interchangeably - they both count arrangements
When objects are identical, we still use regular permutation formulas
In circular arrangements, we use the same formula as linear arrangements
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