Permutations and CombinationsMTP Mar 22Question 1642 of 171
All Questions

If nP4=20nP2\displaystyle ^nP_4 = 20 ^nP_2 then the value of 'n' is _______.

Options

A7
B7
C-2 and 7 both
Dnone of these.
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Correct Answer

Option a7

All Options:

  • A7
  • B7
  • C-2 and 7 both
  • Dnone of these.

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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