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On the occasion of Deepawali festival each student of a class sends greeting cards to the others. If there are 20 students in the class then the total number of greeting cards exchanged by the students is?

On the occasion of Deepawali festival each student of a class sends greeting cards to the others. If there are 20 students in the class then the total number of greeting cards exchanged by the students is?

Grade:12

2 Answers

sayanti
12 Points
6 years ago
The required formula is 2 * nC2=n*(n-1) since number of freinds is 20. Then n=2 Required number of greetings card 20*(20-1)=20*19=380
sayanti
12 Points
6 years ago
The required formula is 2 * nC2=n*(n-1) since number of freinds is 20. Then n=20 Required number of greetings card 20*(20-1)=20*19=380

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