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Fundamental Principle of Counting

The students ...

Question

The students in a class are seated according to their marks in the previous examination. Once, it so happens that four of the students got equal marks and therefore the same rank. To decide their seating arrangement, the teacher wants to write down all possible arrangements one in each of separate bits of paper in order to choose one of these by lots. How many bits of paper are required?

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Solution

All 4 student secured equal marks therefore same rank
So in order to write all possible arrangements one in each of separate paper in order to choose one of these lots=4!=24
It is basic thing number of ways to arrange 4 things

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