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

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Where do you go to learn how to make ice cream?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Can you guess the name of the month by looking the below rebus ?

During which month do people sleep the least?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

The Little ant seems to be always confused. Do you know why?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Solve the following series:
AZ, GT, MN, __, YB