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Grade 12th passMagical Mathematics[Interesting Approach]

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 .

Manish kumar

7 Years agoGrade 12th pass

1 Answer

Saurabh Koranglekar

Approved Tutor Answer7 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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