A room has 10 doors. In how many ways can a man enter the room by one door and come out by a different door.
Options
A90
B100
C50
DNone of these
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Permutations and CombinationsMTP Jun 24Question 1678 of 159
All Questions Correct Answer
✅ Option a — 90
All Options:
- A90
- B100
- C50
- 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 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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