Permutations and CombinationsPYQ Sept 25Question 4265 of 176
All Questions

Find n\displaystyle n if nP5=20nP3\displaystyle ^nP_5 = 20 \cdot ^nP_3

Options

A7
B8
C9
D10
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Correct Answer

Option b8

All Options:

  • A7
  • B8
  • C9
  • D10

About This Chapter: Permutations and Combinations

Paper

Paper 3: Quantitative Aptitude

Weightage

4-6 Marks

Key Topics

Factorials, Permutations, Combinations

This chapter deals with the fundamental principles of counting. It covers factorials, circular permutations, restricted permutations, combinations, and the differences between selecting items versus arranging them.

View Official ICAI Syllabus

Exam Strategy Tip

The most common mistake is confusing 'P' (Arrangement) with 'C' (Selection). If order matters (like opening a lock), use P. If order doesn't matter (like choosing a team), use C.

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