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Grade 12Algebra

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?

Profile image of pratya
9 Years agoGrade 12
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2 Answers

Profile image of sayanti
9 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
Profile image of sayanti
9 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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