On the occasion of New Year, each student of a class sends greeting cards to the others. If there are 21 students in the class, what is the total number of greeting cards exchanged by the students?5
1106 5b5cc6b9e4d2b4197774d757
Q: On the occasion of New Year, each student of a class sends greeting cards to the others. If there are 21 students in the class, what is the total number of greeting cards exchanged by the students?
- 1380false
- 2420true
- 3441false
- 4400false
- Show Answer
- Workspace
- Discuss