Prepare a greeting card with dry leaves.

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.

Three different greetings cards and their corresponding covers are randomly strewn about on a table. IF Sita puts the greetings cards into the covers at random, the probability of correctly matching of all the greeting cards and covers is ……

If you did this experiment of respiration with fruits and dry leaves, what would the resutl be? Explain.

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

It is difficult to burn a heap of green leaves but not a heap of dry leaves.Explain Why?

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.

Name some animals which eat different parts of the plant like green / dry grass, leaves and branches.

One card is selected from a well shuffled deck of 52 cards. Find the probability of getting a red card with prime number.

From the deck of 52 cards, if a card is randomly chosen , find the probability of getting a card with a prime number on it?

From the deck of 52 cards, if a card is randomly chosen , find the probability of getting a card with face on it?