जॉइन Examsbookउत्तर : 2. "420"
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
प्र: 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
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उत्तर : 2. "420"
व्याख्या :
Answer: B) 420 Explanation: Given total number of students in the class = 21 So each student will have 20 greeting cards to be send or receive (21 - 1(himself)) Therefore, the total number of greeting cards exchanged by the students = 20 x 21 = 420.