The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

Can you find the 09 errors in the picture below?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?