In a class there are 30 students. On the New year day, every student posts a greeting card to all his ther classmates. Find the total number of greeting cards posted by them.

In a class there are certain number of students. On the new year day every student posts a greeting card to all of his classmates. If the total number of greeting cards posted by them is 870. Then find the number of students.

In a class, there are 45 students. On a new year eve, every student sends one greeting card to each of the other students. How many greeting cards were exchanged in all?

In a class there are 30 students. If each student plays a game of chess with each other student, then find the total number of games played by them.

In a class there are 50 students. If each student plays a chess game with each other student, then find the total number of games played by them

On the occasion if Deepawali festival, each student in a class sends greeting cards to other. If there are 20 students in the class, find the total number of greeting cards exchanged by the students?

On the occasion if Deepawali festival, each student in a class sends greeting cards to other. If there are 20 students in the class, find the total number of greeting cards exchanged by the students?

On the occasion of Dipawali 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

In a class there are certain number of students and each student plays a chess game with each other student. If the total number of games played by them is 190. Find the number of students

The given bar graph, shows the number of students in different classes. Find the total number of students in the classes VIII to X.