There are N students in a class. Their class teacher gave them a task of finding the average of first N natural numbers and each of them left out a different number and found the average of the remaining numbers. The average of the averages obtained by all the students was 21. Find N.

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Anjali Khatri · Answer

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There are N students in a class. Their class teacher gave them a task of finding the average of first N natural numbers and each of them left out a different number and found the average of the remaining numbers. The average of the averages obtained by all the students was 21. Find N.

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