Subject
Quantitative Aptitude
Topic
Permutation & Combination
There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room?
There are 3 doors to a lecture room. In how many ways can a lecturer enter and leave the room?
ক)
1খ)
3গ)
6ঘ)
9Explanation
They way of entering is 3 and exiting is also 3, therefore the total way will be 3*3=9.Related questions
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