You are returning home from school. On the way, you find a sealed envelope in a street, fully addressed with unused stamps on it. You would :

Q. You are returning from your school to your home. On the way, you find a sealed envelope in a street fully addressed with un-used stamps on it. You would

Q. Activity: Let's make an envelope and post our letter too!

1.	Take a square piece of paper.
2.	Fold all the four corners to make folds.
3.	Fold two corners and paste them with a little glue.
4.	Fold the third corner and paste it with glue.
5.	Leave the fourth corner open.

Write the address neatly on the envelope and fix the stamp on the right corner.
Put the letter inside it. Now seal the fourth corner as well.
Your letter is ready to be posted to your friend.

Q.

Three letters are dictated to three persons and an envelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.

Q. Three letters are written to three persons and an envelope is addressed to each of the the letters are inserted into the envelopes at random so that each envelope contain exactly one letter. Find the probability that at least one letter is in its proper envelope.

Q. Three letters are dictated to three persons and an envelope addressed to each of them, the letters are insearted into the envelopes at randomly so that each envelope contains exactly one letter . Find the probability that atleast one letter is in its proper enbelop .