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  1. 1
  2. 2
  3. 10
  4. 16

2 Answers

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For people like me who cant apply pigeon hole concept properly.

Four of them are guaranteed to get the same grade.

Let the same grade be A and imagine the worst case.

worst case : -

Pick a student serially and give him a grade serially.

1st student A grade

2nd student B grade

3rd student C grade

4th student D grade

5th student E grade

6th student A grade

7th student B grade

8th student C grade

and so on.

repeat this till you give grade A to 4 students.

It will be 16.

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