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In occasion of new year every students of this class exchange the greeting card with other students if toatal conjuction of card 600 then find the no of student . Plz analyse it in better way or easily or solve .

In occasion of new year every students of this class exchange the greeting card with other students if toatal conjuction of card 600 then find the no of student .
Plz analyse it in better way or easily or solve .

Grade:12th pass

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
Dear student

Lets start with 2 people - 2 exchange
3 people - 6 exchange , 4 people - 12 exchange

Similarly n people - n*(n-1)
For 600 exchange - we have n = 25

Regards

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