[" Write a letter to your friend in Nagpur stressing on the importance of t "],[" care of grandparents in this pandemic situation."]

What is poultry farming? Write its importance. How can you care poultry?

A' writes a letter to his friend B and oes not receive a reply, it is known that one out of 'n' letters does not reach it's destination. What is the probability that 'B' didn't receive the letter ? It is certain that 'B' would have replied , if he received the letter.

A' writes a letter to his friend B and oes not receive a reply, it is known that one out of 'n' letters does not reach it's destination. What is the probability that 'B' didn't receive the letter ? It is certain that 'B' would have replied , if he received the letter.

Write answers to the given question in your own words: What is the importance of air in transmission of sound?

A person writes letters to 6 friends and addresses a corresponding envelope. The number of ways in which 5 letters can be placed in the wrong envelope is?