If $^nP_1 = 20 \cdot ^nP_0$, where $P$ denotes the number of permutations, then $n$ is:
Options
A4
B2
C5
D7
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Permutations and CombinationsPYQ Nov. 20Question 1605 of 159
All Questions Correct Answer
✅ Option d — 7
All Options:
- A4
- B2
- C5
- D7
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 SyllabusExam 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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